-5 models began in 1988.
Discontinued in 1989 for the full-lug -6 model.
No clue on production numbers, sorry.
I have a -4 model with the 8-3/8" bbl. It always draws interest at the range.
Variations were 10-shot models, 16 were made in nickel finish, 36 were made with 7-1/2" barrels, 200 were made with SS cylinders & 6" full-lug barrels. 14 were made with SS cylinders & 4" barrels.
Standard options were the usual target trigger, hammer & sights. There were some square butt models made during your gun's era too, 4" bbl.
Hope this helps!