Jag föreslår försiktigt tre olika förklaringar.
"...very likely a wry gift from an archaeologist wishing to remind the museum staff of why most of their colleagues dig. ... Maybe the finder's parents (they're from the Empire's territory, after all) seeded the trench to entertain their daughter. Or maybe, just maybe, and I'm speculating wildly here, it might have been dropped by a visiting coin collector in the decades after WW2."
Det jag framhåller som mest troligt ("very likely") är att myntet lagts dit här om dagen av en arkeolog.