On the right hand side of the action in front of the cocked indicator there should be a number in numerals ie I /II / III / IV / V That is mark 1,2,3,4, or 5 , Probably a MkII with that date.
On the right hand side of the action in front of the cocked indicator there should be a number in numerals ie I /II / III / IV / V That is mark 1,2,3,4, or 5 , Probably a MkII with that date.
Unless of course it's a commercial one, so may not have a number.
Try Peter Dyson https://www.peterdyson.co.uk/acatalo...NRY_Parts.html
If your ever stuck you can drill a hole in the end and solder an old bit of drill bit in there, grind it round and it works as a fix.