Mike,

That's a gun with very interesting provenance including the rear sight blade replacement. Needs to be written down and kept with the gun for posterity.

Since you have the shipping info, I presume you have a S&W historical letter. And I further presume it confirms the gun was shipped as a factory target model. Does it mention the King sights? Because S&W would often install King and other makers' sights on special order which would be mentioned in the letter.

If not, it went to King for his sights after it left S&W, which I suspect because it has a S&W rear sight first introduced in 1935 with the second elevation lock screw improvement. It could have been upgraded by King with the S&W "2 screw" sight and King's rear sight blade when they installed their light reflecting front sight on your gun.

__________________
Jim
S&WCA #819