The jewelry industry on the east coast was pretty huge during fifties and sixties. They used a lot of beads, and even made their own findings, stampings, and components. These small silvertone box clasps were probably custom-made to suit the designs of the company who made them.
I found a lovely variety of two hole, three hole, and four hole clasps, all in silvertone, as well as some interesting three hole components which would look great as the center of a necklace.
I've just added them to my eBay store.

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