I believe I have two authentic 1947 Cinco Pesos, 30 Gramos, Ley 0.900, Mo. that I found in my fathers things today. I know he and my mother traveled to Mexico back in 1952 or so. And from what I read earlier.....no, magnets do not stick to my coins

One feels a little heavier than the other.
How do I find out what they are worth?
I also weighed them and they are 30 grams each. Can I polish them or will that reduce their worth?
Edited by Alice Meyer
06/27/2012 9:08 pm