I have used Alpha Tool and Die in New York City (212) 869-5056, 7 W.
45th Street, New York, NY 10036
I have had several stamps made there. Logos and karat stamps. They
are a bit expensive but their stamps last a long time and are well
worth the expense. You will have to send your logo to them and they
will give you a quote to create the stamp, and their recommendations
on size etc. My first logo stamp was made back in 1992 and is still