I don't collect them, but I do have a few...
I cannot answer all of your questions, but I do know that the pins are STRONGLY magnetic and are unlikely to be made of tin, which is weakly magnetic at best. They are likely steel or other iron based alloy...
My 2 cents...
Last edited by Eggoman; 07-07-2017 at 12:44 PM.
Reason: typo
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