1000 Lire

San Marino's silver 1000 Lire series from this period was struck under an arrangement with the Italian State Polygraphic Institute, with each annual issue tied to a declared theme — 1991's being the history of technology. Mintages were tightly capped and coins sold primarily through philatelic and numismatic offices rather than entering circulation, meaning nearly all survivors are in original packaging.

KM#270 belongs to a run of San Marinese commemoratives that collectors either pursue comprehensively by year or ignore entirely — there is little middle ground in the market for these.