Authentic Mexican coin, 1952-56, made into buttons by a Four Corners button artisan. 5/8" in diameter, domed, with a satin sheen, and shank back with an opening around 2mm.  These are real coins, made from brass, not replicas. The front is the eagle and snake side. The back has "1 c", the year of the coin and the shank. Quite good and consistent condition. $4.25  each