5 Kopeks Arktikugol

Arktikugol — the Soviet coal trust operating on Spitsbergen under the Svalbard Treaty — issued its own scrip currency beginning in 1931 because Norwegian sovereignty over the archipelago meant Soviet rubles had no legal standing there. Workers at the Barentsburg mines were paid in this internal currency, redeemable only at the trust's own company store. It was a closed monetary loop by design, not accident.

The 1931 series is the first and most historically significant issue. Surviving examples in any condition are genuinely uncommon — the scrip had no reason to leave the island, and much of what wasn't spent was simply discarded or lost.