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Original – Russian Empire, Catherine the Great, Sestroretsk Rouble (1771). This one-rouble coin was designed to be kept in the treasury as metallic backing for the country’s paper rouble issue. Solid copper, weighing just over 1.022 kg (2.25 lb), the Sestroretsk rouble has a diameter of 77 millimetres (3+3⁄100 in) and is 26 millimetres (1+1⁄50 in) thick. For size perspective, it is essentially the same (+1mm) as a standard hockey puck.
Reason
High quality image, high EV, good condition, extremely rare, reportedly the largest copper coin ever issued.
Support – For EV – very unusual type of 'coinage,' if that's the word for it. Never heard of copper backing for paper currency.Sca (talk) 14:23, 3 September 2015 (UTC)[reply]
First paragraph in the history section refers to it, no? Info came to me via the Smithsonian. I'll try to find some refs...--Godot13 (talk) 02:36, 4 September 2015 (UTC)[reply]