Numismatic Puzzle: Double-Headed Eagle on a Platinum Ruble

The piece of today’s puzzle comes from a Künker auction:

Russia. Nicholas I, 1825-1855. 12 rubles, platinum, 1841, St. Petersburg. Only 75 specimens minted. NGC MS61. Extremely fine to FDC (Prooflike).From Auction Künker 391 (2023), lot 458. Result: 220,000 euros.  

Have fun with the puzzle!