It’s a nicely done insert. The factory used to do inserts on fixed sights like my model 642 but they don’t anymore. I asked them to do one on my model 65 3 inch some years ago and found out they only were doing it on adjustable sights n
That very well could have been done at the mother ship. In the day they would put that insert in any Smith that you brought to them. You used to bring them to the front door and drop them off and if it wasn't busy, you could come back in a couple of hours and pick it up. That's a really nice gun.
So I'm guessing maybe someone sent it back to S&W and had it added? I wonder if S&W did special orders for new guns back then?
While not standard, that was easy to have done at the factoy. Especially if you were a LEO.
That looks to ,e to be a factory job. Have you looked for return markings on the frame under the grip?
I used to live 90 miles from factory and was an active duty constable in my town. I used to take all my guns to the factory for mods. Show up in the morning, see the service manager, look at the exhibits, go have lunch, and come back an your gun would be ready to go. Usually no charge.
My model 65-1 is out there with a red ramp, factory action job and target hammer.![]()