The 1276 is a solid-gold piston pen, produced 1971 to 1975 (according to Collectible Stars). First cleaning attempts with a clear water bath are often successful; if writing behaviour is still too fine afterwards, nib swap or service repair come into consideration but are economically only sensible on valuable pieces. Repair addresses can be found under Care–Repair and weblinks on fountainpen.de; further hints come via regional collector regulars' tables (e.g. Karlsruhe via the C.A.S.). For sale, waiting until the end of the summer holidays and turning to collector or show platforms with fair pricing is recommended, instead of often uninterested stationery specialist dealers.