Thanks to everyone who wrote about oxy-acetylene supplies. The
answers will probably solve my problem.
I have to mark my pieces here with the karat and with my own mark
here in the USA. Who can make me a punch. I’ve yet to see any supplier
who makes hall marks. My original one’s are held in the UK at
Goldsmith’s hall and I’m reluctant to take them away as it would mean
that I’d get delays in having them hall my pieces over there.