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I guess you could try a hot pin test on the inside of one to know for sure, but be careful if you light off Celluloid it burns fast....

I have seen that scale style before, mostly on East Coast...

They look more like Celluloid to me in the pic, But I tried the scratch-n-sniff option on the picture and it wasn't working :D

Sometime Celluloid scales will get a "patina" for lack of a better...