Most likely, the reverse half a replica. The original is 37mm in diameter and weighs 41.66 grams, 90% fine; or 37.5 grams of gold. You would read: "50 Pesos 37.5 Gr. ORO PURO 1821 1947".
1947 was the last year of that issue. 309,200 were issued.
Don.......