These Hi-Test wrenches were made in Japan for an import and mail order company based in New York named Hi Test Premier. The odd 19/32" size corresponds to 15mm (probably coincidently) and was used on older machinery, I've seen the bolt head size on 8N Fords, why I do not know. The finish is a little rough but quality doesn't look too bad.
According to Alloy Artifacts, Hi-Test Premier was in business from the 1950s through at least the 1970s.
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