one more thing to consider is the average price of silver in 1974 is $4.391 per ounce. and the exchange rate is 7.07 peso to a dollar. or 31.04 peso per ounce.
now 90% silver content at 26.4 gram will come out 23.71 peso for each 25 peso silver coin.
50% silver content at 25.0 gram will come out 12.48 peso for each 25 peso silver coin.
during 1961 to 1964. face value is one peso. the central bank sell them for 3 peso. or 200% over face value.
if you say the 25 peso silver coin is 90%. then the central is break even. if you say it's 50%. then central bank get 100% profit.
now. let say the proof version is 90%. the central bank sell them at a big premium. isn't it?. so the central bank get a good profit. but for uncirculated version with 90,000 pc can the central bank just sell it without making profit. what about the production cost, fabrication cost, management cost, and the shipping and packaging cost?. the silver melting value is already near 25 peso.