This is an original, not recast, matched, stamped, 12 bolt set of Yokohama straps/brails for a diving helmet. These are a matched factory set stamped 15 under each of them as shown. These were used in the California abalone diving industry and traces of the black rubber from the 12-bolt neck ring of the dress can be seen under some of them. The front two straps are indicated with a single angled line at the bottom front and the back two indicated by a cross X at the bottom end. This would have been done by the diver or his tender and was common in the helmet diving industry. There is minimal wear on the surfaces, so they appear not have been used much. These items came from the diving locker of an old commercial abalone and construction diver.

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