I was recording the serial numbers of my firearms to keep on record and discovered my Model 29-3 has two different serial numbers stamped on the frame. The one on the butt is
Nxxx185 and the one on the frame under the yoke area is Nxxx187.
I have a Model 10 and the numbers on the butt and under the yoke area match.
I messaged S&W on their website but haven't heard from them yet.
I thought maybe someone here would have an answer.

Thanks, Sam