Originally Posted by
Jim K
Nope, the number on the loading gate is an assembly number and will not (except by coincidence) match the last three of the serial number. It should match the frame assembly number which is on the frame but can't be seen until the front strap/trigger guard is removed.
So, what is an assembly number? A manufacturer often has parts that are carefully fitted to other parts either for working together or for appearances. In an older S&W revolver, the crane was fitted to the frame, in the Colt SAA the loading gate was fitted. But the fitting is done before final polishing and bluing or case hardening and the assembly number is used to make sure the proper parts get back together again after the finish work is done. The serial numbering was done later after the polishing and other finish work was done and just before bluing or case coloring.
Jim