Pretty sure they use some type of magnetic type pins to hold the items.
Joe
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 "Ty Cobb, Spikes Flying"
Collecting Detroit 19th Century N172, N173, N175.
N172 Detroit. Getzein, McGlone, Rooks, Wheelock, Gillligan, Kid Baldwin Error, Lady Baldwin, Conway, Deacon White
Positive transactions with Joe G, Jay Miller, CTANK80, BIGFISH, MGHPRO, k. DIXON, LEON, INSIDETHEWRAPPER, GOCUBSGO32, Steve Suckow, RAINIER2004, Ben Yourg, GNAZ01, yanksrnice09, cmiz5290, Kris Sweckard (Kris19),Angyal, Chuck Tapia,Belfast1933,bcbgcbrcb,fusorcruiser, tsp06, cobbcobb13
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