Without the S&W logo, we can date the revolver to 1917 -1920. The stocks look correct and were made from 1910 - 1920. Lastly, your serial number shows 1918 or 1919 ship date from the factory so everything looks original.

Almost 100,000 revolvers were sold from 1917 to 1920, and both round-butt and square-butt guns were made. I do not know of any source to identify numbers made of each butt-frame, but even if only 25% round-butts were made, that is 25,000 so doubt that they could be considered as scarce. Round-butt revolvers were made up to WWII and continued after the war. As far as I know, it was square-butt revolvers that ultimately disappeared in the Model 10 line.

Just checked the old SWCA database and of those identified, 70% were round-butt. This is a totally random collection of guns, so probably little accuracy in that number.

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Gary
SWCA 2515