Reform was a brand of the Mutschler firm of Heidelberg-Handschuhsheim, which most recently mainly acted as a supplier to other writing-instrument makers and ceased operations a few years ago. The Reform fountain pens, both piston and cartridge fillers, are regarded among collectors as technically and qualitatively high-class, but in German collector literature they are barely documented; in Tischler's Penkala the firm is listed in the appendix list of stationery makers. More detailed information can be found on hanskress.de (kress3.htm and kress-innenseite2.htm). In the USA and Thailand unused Reform pens are now traded for up to 25 US dollars, while at German flea markets they are often available for around 1 euro; the relevant knowledge in the USA comes mostly from German sources.