Piéforts are struck at double the normal planchet thickness specifically for archival and presentation purposes — they were never intended for circulation and exist in tiny quantities almost by definition. Monaco's post-war coinage program under Rainier III was still being established in 1950, and essai strikes like this one preceded the approval of final production dies, meaning the piece documents a decision point in the coin's official adoption rather than its conclusion.
Piéforts are struck at double the normal planchet thickness specifically for archival and presentation purposes — they were never intended for circulation and exist in tiny quantities almost by definition. Monaco's post-war coinage program under Rainier III was still being established in 1950, and essai strikes like this one preceded the approval of final production dies, meaning the piece documents a decision point in the coin's official adoption rather than its conclusion.