Polished on the reverse. Nice obverse.
A very rare, technological sample of the State Mint.
One of two proofs complementing the 1949-57 brass proofs. Differing in form of execution, as the denominations introduced in 1958 (2 and 5 gold) were not marked with a concave SAMPLE inscription, and it was placed on the stamp (as a result, it is convex on the coin).
Mintage of 100 pieces.
