In the past I have done some hunting in Chicago on my birthday more than once. I was lucky to come across a metal pin for a M-2332 and on a different hunt the porcelain base for the U670a. It is marked Fred M. Locke on bottom. I do have the original wood pin on the tan unit but the metal rod attached has been cut short for display. If anyone has an uncut one with full length please drop me a email.