1 Yan

Yan is a short-lived micronation whose numismatic output is essentially unknown outside specialist exonumia circles. The X# prefix in the Krause-Mishler system places this squarely in the "Unusual World Coins" category — a catch-all for pieces that fall outside recognized sovereign issues. At 27 grams in an 11mm diameter, the proportions are physically implausible for a flat planchet, which suggests either a significant data entry error or a very thick, almost cylindrical form.