100 Roubles N.D. Zelinsky

Transnistria issued this coin as part of a series honoring Soviet-era scientists, despite being an internationally unrecognized breakaway state dependent on Russian political and economic support for its existence. Nikolai Zelinsky, the organic chemist who developed the first effective activated charcoal gas mask during World War I, is one of the more defensible choices in such a series — his work saved tens of thousands of lives on the Eastern Front after 1915.

Transnistrian commemorative silver from this period was struck primarily for collector export rather than domestic use, as the local economy ran on its own unbacked currency.