Maybe this is an unnecessary post but since 5 and 50 centavos from the period exhibit different weights (which is a novelty for me) and its mostly due to different mints, I am wondering can we confirm all of these have the same weight, too. 10 centavos are pretty straightforward with less types in the 70s and 80s leaving no room for such a possibility.
I collect by type so usually have only one:
1977 - 2.54g which is in line with existing data.
1970?
‘73 and ’75 from Sheritt?