"Lustrzanki" of the Kingdom of Poland, or more precisely, coins minted with a polished stamp on specially prepared disks, are, next to the famous 1917 single-figure coin, the rarest coins of this issue. Very rarely found on the antiquarian market.
The second and last vintage of the 10-fenigree.
In the specialized catalog for the period, by Jerzy Chalupski, described at the R7 rarity grade, with uncertain information about the mintage of only 20 pieces!
A mint coin with a mirror-like appearance - a beautiful black mirror and a contrasting bright relief.