Recently purchased this vintage JJ and I'd like to find a signed JJ buckle that is generally appropriate for that era. I have been unable to find any buckles that are not gold. No luck finding anything related to this particular reference number either.
I did a quick look around internets, and you seem to be right! IF you don't get lucky, I wonder if you could get one of the gold plated ones, and either strip the gold, or just plate rhodium on top. THIS guy is really pretty awesome at answering questions, and has inexpensive kits that seem to work pretty well: https://www.beckerindustries.com/