I have never come across another board where vintage sigs is the main topic.
There are many boards, including this one, which have a smattering of everything.
I recently did join the Sports collectors.net website for the addresses to get some TTM sigs. In my searches, the vintage stuff, akin to what you are interested in, is few and far between.
I think Net54 is about as good a place as any to discuss and show off your interests, but I do think that you need to network far and wide to find new additions for your passion.
Mark
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