Question: are waterman cartridges standard international?
Answer: 'International Standard' cartridges are a common pattern in use by most European and Japanese fountain pen manufacturers. ... Major brands that DO use standard cartridges are Faber-Castell, Kaweco, rotring, Porsche, Caran d'Ache, Waterman, Tombow, OHTO, Pelikan, Visconti and Schneider.