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<p>[QUOTE=&quot;sabre123, post: 9480830, member: 8258&quot;]Starrett Patent number is 2275258. First patented in 1941, with an estimated expiration of 1959. So, around 1959, they probably stopped putting the patent on the mechanism. But there were a lot of them sitting on shelves in hardware stores all over the country.</p><p><br /></p><p>I think if you picked either 1950s or 1960s, you&#039;d be in the wheelhouse.</p><p><br /></p><p><a href="https://patents.google.com/patent/US2275258A/en" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://patents.google.com/patent/US2275258A/en" rel="nofollow">Patent info-&gt;</a>[/QUOTE]</p><p><br /></p>

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