Welcome to the forum. For reference SN S209632 is an 8 3/8" Model 27 that shipped in November 1960.
Here she is with a set of Keith Brown custom grips:
Congrats on the acquisition - you started at the pinnacle of revolver evolution. The N-Frame .357 Magnum model 27 is one of the finest handguns to ever roll off the S&W assembly lines.
Thanks for sharing,