As part of a lot of world coins that I acquired at auction, one coin in a group of 15 Portugal 2 1/2 Escudos looked a bit odd as it (the 1977) was noticeably thicker than the others.
Krause (KM# 590) gives the composition as cupro-nickel
and weight as 3.5 g and the diameter but does not specify the thickness.
I've tabulated the year, condition, weight and thickness as follows:

All the coins in my small sample appear to have the same diameter.
Does anyone know what the official thickness was ?
Are these variations typical ?