10 Lire The footprint of man's poisons

San Marino issued a series of thematic 10 Lire pieces throughout the 1970s addressing environmental and ecological concerns — unusually pointed subject matter for a small republic whose coinage was aimed squarely at the collector market rather than circulation. The 1977 issue fell within a broader UN-influenced moment when environmental degradation had become a formal diplomatic subject, following the 1972 Stockholm Conference on the Human Environment.

KM#66 is one of the scarcer single-year types in the run, with mintage figures kept deliberately modest to sustain collector demand.