Welcome! The configuration of that revolver is pre-1927 and if it has MADE IN USA stamped on the right side of the frame it is post-1922.
I would immerse the butt in a can of paint remover, cover it and soak it for a few days until the glue that holds the wood comes off. My guess is that some owner found a set of Model 1917 N frame stocks and had to "build out" the butt-frame. Removing that wood is the thing to do to bring the gun back to original configuration. You can find square-butt stocks on ebay from the 1920s quite often and put them on the gun. The checkered diamond K frame stocks are much nicer and would have been what was on the gun when it left the factory.
Do not sand off the wood, since you will destroy the finish on the steel underneath. Stocks should look like the ones below.
Let me add that when that alteration was done, there was no law requiring visible serial numbers to worry about. That BATF regulation came much later. Also, look under the barrel for a serial number and let us know what it is? The serial number should be around the 300,000 range. Do't scrape any further on your frame just soak the glue off and you should see a 6 digit number. The teltale frame marking for the 1920s is the small logo on the left side of the frame.