TWSBI
Taiwanese pen brand TWSBI took the pen world by storm in the early 2010s, releasing high quality piston filler fountain pens at an unheard-of price point. TWSBI continues its success today, offering a range of different models, including vacuum and cartridge/converter fillers, as well as inks. (The T.G.S. Curated Shop is an authorized retailer of TWSBI products.)