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This vintage lot includes two slide buckles that I'm reasonably certain are celluloid (hot water testing provided a whiff that reminded me very unpleasantly of mothballs). Both are rather small, coming in at just a little over 1.5" tall apiece.
I make use of recycled packing and shipping materials, both to be eco-friendly and to minimize shipping costs. So don't worry--it might have come to you in an old television box, but your item was packed with care to arrive safely on your doorstep.