I guess I was too hasty!
It could also be a different denomination.
If your coin is 39/32 inches then it is 31 mm.
If your coin is 29/32 inches, then it is 23 mm.
Can you clarify which?
The coin in the link (1 paisa 1888-1891) is 23 mm = 29/32.
Edited by tdziemia
02/17/2019 6:13 pm