FWIW,,,I had and have since sold a Model 3 New Model Target (hope I got that right!).
Factory letter confirmed Nickel finish, Target Sights, 5" bbl, HR grips, 44cal (it was in 44Russian).
It had the non-rebounding cylinder and was shipped Dec 29 1915 IIRC. Pretty late I suspect

I still have a copy of the letter around somewhere.