Nice looking gauge. My guess is it's made out of Mahogany. Take the rule off and see if there's an old worn scale under it. There might be some other information there too.
So, the dating of your cigar gauge may be around the turn of the 20th century.Institute of Texan Cultures Collections Blog said:From the late 19th through early 20th century, there were a number of inventions made to help speed up the process of making cigars. Gauges like this one, at the Institute of Texan Cultures, helped to ensure each cigar was made to the same standard length and diameter. This cigar gauge was patented by John J. Sander of New York, in 1884. Mr. Sander was known to have been in business with his father-in-law George P. Bruck. He he lived in Brooklyn, having arrived there in about 1880 with his parents who had emigrated here from Germany in 1874.
https://texanculturescollections.wordpress.com/2013/11/25/i-0046i/
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I think so. and then there's this.. https://www.google.com/patents/US308115
nice vintage technical drawings...how cool is that?? I have a cousin who is an independent architect...he'd really appreciate this.