A T.G.S. Exclusive Returns: Reintroducing the T.G.S. x Sunderland Machine Works mk1

After all these years, the Sunderland mk1 remains my favorite machined pen of all time, and I’m pleased to announce that we now have more of our exclusive design on their way, set to arrive next week. This was our first store-exclusive pen, initially released back in 2021, and I’ve always intended to bring in more, though for many different reasons it’s taken longer than originally hoped. The T.G.S. x Sunderland mk1 features a bead-blasted, matte black finish with a bead-blasted DLC-coated clip. The section is a matte red/burgundy, with the overall color scheme designed to evoke the T.G.S. core colors burgundy & black. While you can read more about the specs of the Sunderland mk1 in our full review of this pen, what I truly love about it is how well the pen posts, and the contoured grip. The internal threads are recessed into the nose cone of the pen, so they will not interfere with your writing.

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Despite three years having passed, and costs having increased, we’ve managed to keep the price of this edition close to the original. The T.G.S. Sunderland mk1 will retail for $115, which includes U.S. shipping. All pens ship with a Pilot G2 refill. You can pre-order today, with the pens currently set to arrive mid-to-late next week.

Note: If you’re an international buyer please review our shipping policies, including our UK order threshold. If your country isn’t currently listed on shipping options when you try to check out, please contact me through the site and I will see what I can do.

Refill Options for the Sunderland mk1

While the Sunderland mk1 was designed to accept Pilot G2-style cartridges and the Montblanc rollerball and fineliner cartridges, with a little hacking I’ve been able to fit multiple popular refills in this pen, including the Pentel Energel, the Zebra JF (the Sarasa Grand and Sarasa Grand Vintage refill), and the Uniball One refill, all of which require a small spacer at the back of the pen. I use a small piece (3-4mm long) of plastic aquarium tubing, though you can also use a small folded/wadded piece of paper, or wrap washi/masking tape around the end of the refill to increase its length. (Yes, I know there are other many “guides” and lists of “compatible” refills, but I try to only list those that I have personally tried myself.)

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If you have had success using specific refills with the Sunderland mk1 pen, please drop a comment below so that I have a list of new refills to try. This is actually a very versatile machined pen, but since they are made in small batches they often don’t get as much attention as they should. Let’s change that!

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Considerations in Choosing a Store-Exclusive Pen

This was an exciting week, representing a big milestone for T.G.S.: My first collaboration with a penmaker on a shop-exclusive pen! I realize that this isn’t anything particularly unique - pen bloggers, podcasters, Youtubers, Instagrammers, you-name-it, have been collaborating with makers and manufacturers for years on exclusive designs and colors. But I’ve held out until now. Today I want to talk a little bit about why I ultimately decided to take the plunge, the process I went through, and factors I considered before I partnered with Sunderland Machine Works on the new T.G.S.-exclusive Sunderland mk1.

Going with a Store Exclusive Pen over a Limited Edition

The first decision I made, long before I chose a specific pen, was that I wanted a store-exclusive pen to sell for the long-haul, as opposed to a limited edition. It’s not just that I don’t like the “limited edition” marketing strategy, it’s also because taking that approach is inconsistent with what I want my site and my store to be about. If I put the effort and consideration into choosing a product to carry - especially if it’s something that I helped conceptualize - it’s important to me for that product to be available to anyone who wants to get one (at least for as long as it’s economically feasible for me to continue to have the pens made).

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It was extremely important for me to choose a pen design that fits into most notebook pen loops, since the Sunderland mk1 fits into my personal rotation as a note-taking and “on the go” writing pen.

Choosing a Truly EDC-Friendly Design

In line with this goal, for my first collaboration I wanted to choose a design and model that would appeal to the widest possible range of pen users under the broadest array of circumstances. To that end, a fountain pen was out. Despite a large community of enthusiasts, most people - even fountain pen lovers - still use a gel pen, rollerball, or ballpoint for much of their everyday writing. These days, the gel pen has overtaken both rollerballs and ballpoints as the standard “office pen” of choice. So a pen built around one of my favorite gel refills - the Pilot G2/Juice - was a natural choice.

Similarly, when I refer to a pen being “EDC-friendly,” I’m referring to “everyday carry” in the literal sense that it’s a pen that can be used every day as a pen. While durability is a key consideration, I’m not really concerned with the pen being able to double as a glass-breaker, withstand explosions, being run over by a truck, etc. The Sunderland mk1’s streamlined shape was designed for maximum writing comfort, especially the hourglass-shaped section and internal threads. It’s slim and light enough to carry in a shirt pocket, and will fit in most notebook/planner loops, including the loop on my Traveler’s Notebook.

Choosing a Price Point

Finally, I wanted something at a price point accessible to most people. While it’s not inexpensive to produce a pen durable enough for everyday use - especially once you get into special finishes like the bead-blasting and DLC-coating used here, all of which require extra steps in the manufacturing process - $110 is appropriate for something intended not as a collector’s piece, but an everyday “workhorse” that should last for years, if not decades.

I hope you all enjoy the new T.G.S. collaboration pen with Pennsylvania-based Sunderland Machine Works. I certainly enjoyed working on this project, and my plan is for it to stick around in the shop for as long as readers and customers remain interested. A huge shout-out to my Patreon supporters, many of whom were instrumental in providing early feedback on the design and whose donations allowed me to fund this project on the front end. You can check out the pen for yourself here, and if for whatever reason this T.G.S.-exclusive color scheme doesn’t do it for you, visit Sunderland Machine Works for the full range of their offerings.

T.G.S. x Sunderland mk1 Pens Are Now Available For Purchase!

As of early this morning, the pens are live in the shop! I’m quite excited to hear what people think of this collaboration with Pennsylvania-based Sunderland Machine Works. The Sunderland mk1 might be my favorite machined pen of all time, and for this special store exclusive we chose a bead-blasted, matte black finish with a bead-blasted DLC-coated clip. The section is a matte red/burgundy, with the overall color scheme designed to evoke the T.G.S. burgundy & black. Note that this will not be a “limited” edition - we commissioned an initial run of 50 pens, and I received the first half or so this week with more on the way. So if it sells out, don’t worry, I can and will get more! Visit the Curated Shop to purchase. All pens ship with a black Pilot .7mm G2 refill, and will also accept MB rollerball and fineliner refills. To read more about why I love the Sunderland mk1, check out my review of their standard model.

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A key selling point of the Sunderland mk1 is the lack of any external threads that might interfere with your grip. The threads are actually inside the tip of the pen!

All orders automatically qualify for free domestic U.S. shipping, so be sure to combine your order with any other items you have your eye on in the shop! We carry a wide range of pens, paper, and desk and reading accessories. Recently, we also added the TWSBI Diamond 580 ALR in “Prussian Blue,” as well as the new TWSBI ECO Lilac, to our offerings!

The T.G.S. Curated Shop is an authorized retailer of all brands we carry. By shopping with us, you are supporting original content, pen reviews, pen show events, etc. from The Gentleman Stationer. If you would like to support us even further, please consider checking out the T.G.S. Patreon Program, which offers access to online meetups, exclusive discounts and pre-orders, and more!

Pen Review: Sunderland MK1 Machined Pen

The Sunderland mk1 is one of the best machined pens, if not the best, I have ever used. Period. Longtime readers of The Gentleman Stationer know that I don't hand out that sort of praise lightly, but I will where it's warranted, and here I see little room for argument. Proudly made in Coopersburg, Pennsylvania, USA by Sunderland Machine Works, the mk1 is described as "tough enough for the shop," but "good looking enough for the boardroom." Sunderland takes a different approach from most makers in this space, bypassing the "tactical pen" market and instead targeting the mk1 as a "machined executive pen." It's a strategy that's a bit risky since it arguably brings a small company into direct competition with much more established makers of executive accessories, but the mk1's combination of durability and elegance makes it a formidable entry into this market segment, especially given the quality at the price point.

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The main issue I have with many machined pens is the lack of writing comfort due to size and weight, as well as their tendency towards unrefined designs that look chunky and unfinished. As Sunderland implies in their description of the mk1, some of these pens appear as though they're intended to be used as glass-breakers or weapons first, and pens second. (Given the typical target market demographic, that may in fact be the case). The mk1, however, is designed to be used as a pen, and a daily writer at that, and if you're a fan of rollerballs this could easily serve as a single-pen setup.

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Yes, the threads on this pen are internal, contained in the recessed area around the tip.

The mk1 looks and feels like a much more expensive pen than its $85 price point. The fit and finish on my pen are flawless: the threads turn smoothly, the cap posts securely, and the textured, slightly concave section offers a comfortable grip. Sunderland's key innovation, however, involves the threads: they're hidden inside the tip of the pen, so no part of the barrel can interfere with your grip. This patent-pending design offers a "third way" for securing the cap on machined pens - an alternative to sharp external metal threads that dig into your hand and friction-fit caps that inevitably loosen and rattle over time. Similarly, the placement of the threads inside the cap allows you to post the mk1 deeply and securely, without any sort of unpleasant metal-on-metal grating sound or damage to the finish of the pen.

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The body of the pen is machined from 6061 aluminum, and the clip from 17-4 aerospace grade stainless steel, reflecting the professional experience of the maker, who has both engineering and machining experience in the aerospace, automotive, and medical industries.

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The stainless steel clip is sturdy and has excellent tension. It’s neither too loose nor too tight, and grips a shirt pocket or notebook cover perfectly.

But all this merely serves as a setup for what I consider the best part of this pen: the refill options. Rollerball and gel refill preferences are strongly subjective, so I expect many people to disagree with me here, but Sunderland's decision to design a pen to accept both the Pilot G2 gel cartridge and Montblanc's threaded rollerball/fineliner refills instantly won me over. The Pilot G2 is great - I actually think it's a crime how many pen snobs disregard the G2 seemingly for no reason other than it's popularity, overlooking the fact that there's a reason why it's one of the most popular gel pens in the world. That said, I'll likely never use a G2 in my mk1 because Montblanc's rollerball and fineliner cartridges are some of the best on the market, especially for the clientele Sunderland is targeting. I strongly prefer Montblanc's rollerball refills over alternatives such as the Schmidt P8126/P8127, because the ink Montblanc uses feathers and bleeds far less on ordinary paper. A Montblanc "fine" refill actually writes a fine line, and the "fineliner" offers a high-quality felt-tip option if that's your preference. Montblanc cartridges are threaded to minimize tip wiggle and rattling, and the fact that Sunderland machined the mk1 to allow you to screw the refill into the barrel underscores the attention to detail and commitment to a solid experience.

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The mk1 disassembled with a Montblanc Rollerball refill

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Sunderland mk1, left, compared against a Montblanc 144 Classique (Petit Prince Edition) and a Caran d’Ache 849 Ballpoint (“Totally Swiss” Edition)

Takeaways and Where to Buy

Fans of more elegant EDC-style pens such as the Schon DSGN Pocket 6, Tactile Turn Gist, and the Matthew Martin OG1 should certainly check out the Sunderland mk1, especially if you are looking for a sleek, streamlined pen that won't appear out of place in a work or business environment, but at the same time doesn't sacrifice any of the durability that machined metal pens have to offer.

You can purchase the Sunderland mk1 directly from Sunderland Machine Works in their online shop. Currently, the mk1 is available in eight different anodized finishes and a handful of special editions. Starting at only $85, the mk1 represents tremendous value given the innovative design and build quality. A pen like this will last a long time, providing you with many years of reliable service.

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Sunderland MK1, left, compared against a Retro 51 Tornado (“The System” edition), and a Lamy 2000 rollerball.

Disclaimer: Sunderland Machine Works provided me with this pen for review purposes, free of charge. I was not otherwise compensated for this review, and all opinions expressed here are my own.