I have two Heritage revolvers, a 24 and a 25, one has a 100 on the crane the other 120. What is the significance of these secondary numbers? Thanks.

Traditionally, the numbers on the yoke ("crane" is a term used by the other company whose name shall not be mentioned here) are assembly or soft-fitting numbers used by the factory to keep main parts of the gun together during assembly. These numbers were stamped also on the yoke cutout in the frame, and on the inside of the sideplate.

I'm npt sure how the Heritage guns were treated in this regard. I just looked at the two that I own, each has a 100-series number on the yoke but nithing on the frame cutout. I have no interest in removing the sideplates to see if they carry inside assembly numbers. Maybe one of the moderators, or perhaps Roy Jinks or someone in the S&W Service Dept can help.

Did S&W's Performance Center build all the Heritage guns?

Thanks. All of the Heritage series were built by the Performance Center. If I ever bother to shoot mine, I will be removing the sideplate first, because I have never come across two S&Ws with as rough and heave of an action as these two. I'll be giving them a nice cleaning and polish on the inside before any use.