1806 Alexander I 5 Roubles

The 1806 5 roubles gold coin was struck using gold from Siberian mines, a resource that fueled Russia's imperial ambitions amid the Napoleonic Wars.

That makes it a tangible link to the era's geopolitical tensions. The obverse bears Alexander I's portrait, engraved by Alexey Alexeyevich, while the reverse shows the double-headed eagle with the denomination. These elements reflect the standardized design introduced in 1802, part of Russia's effort to modernize its currency.

Mintage figures for 1806 are murky; records may have been lost in later upheavals. What we know is that production was likely modest, given the wartime economy.

One oddity: I've handled dozens of these, and not once has one whispered secrets of the tsars. Pity.