Casa de Monedas. These are beautiful coins with nice eye appeal. They are slightly larger than average rounds (33.625g and .925Onza.) They have beautiful luster and are becoming scarce. The 1979 has a mintage of 4.5M and the 1980 6.1M. They come from the oldest mint in the Americas. Free shipping. No returns. Will ship same/next business day upon confirmed payment.