I have a couple of what I think are Chinese (fake??) coins that were in a box of coins from a local carboot sale (fleamarket out of a car trunk!!)..
The two Chinese coins are between 22.1 and 22.4mm diameter and 1.5mm thick and weights are 3.65g and 4g..
The small one that is holes is 17,25mm Dia, .4mm thick and weighs .58g


I didn't pay much for the box of coins and fully expect the two Chinese to be fake and the small coin, possibly something that dangles from a ladies coin bracelet!!
Kind regards, John