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<p>[QUOTE=&quot;techbiker, post: 4486016, member: 60629&quot;]There&#039;s a patent date. I spent a few minutes searching the USPTO but couldn&#039;t find any stretcher keys by &quot;Cutis&quot; around September 1888. If you are curious, you may try searching various terms to track down the inventor.</p><p><br /></p><p><a href="https://ppubs.uspto.gov/pubwebapp/#Basic-Search" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://ppubs.uspto.gov/pubwebapp/#Basic-Search" rel="nofollow">Patent Public Search | USPTO</a></p><p><br /></p><p>I&#039;d guess the painting date is sometime shortly after 1888 (probably pre-1900). Cutis doesn&#039;t seem to have been a major stretcher key manufacturer. If he/she only sold keys locally, you may be able to roughly track down where the painting was painted.</p><p><br /></p><p>P.S. Another possibility is the keys could have been patented in the UK instead.[/QUOTE]</p><p><br /></p>

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