You certainly have a unique Model 66! Thanks for giving more info on the trigger and original owning entity.

My 66 has a target trigger installed, and a yellow front sight insert. I'm guessing someone liked to target shoot in double action. The yellow insert is good in low light.

I also like the K frames. I tried a 586 L frame, but it was a bit heavier than a K frame. I also have a 4" 1978 Model 19-4 (nickel plated) in excellent shape. It is the last dash number to have a pinned barrel and recessed cylinder. (according to wikipedia)

Again, thanks for sharing your engraved '77 Model 66!