HP serial numbers are not located on the yoke, those are model / assembly numbers. The number on the butt frame is officially it. Some models have had serial numbers stamped on the cylinders and barrels, but it is the number on the frame that counts.

I would point out the possible serial number mistake to the Auctioneer before the auction starts. In the interest of legality, I am sure he will check it..

EDIT - I stand corrected. I got to thinking, went down and pulled my S prefix HP out of the safe, and yes, the serial number IS stamped on the yoke, below the 28-2 stamp, as well as the butt.

Larry