I agree 1985ish..
I have a bit later made 19-5 4" that I was told 1986-1987 it's serial is AUL92XX..
Mine came with the original Target stocks with Target hammer & trigger, has the orange insert front sigh but does not have the white outline rear sight, It's plain black which gives a nice sight picture BTW..
I put a set of Combat Stocks on mine that seem to fit my hand much better than the Target stocks, besides they look good on the "Combat Magnum"
Congrats on your Find lilhuff42 & welcome to the forum..
Here's some pics of my Pawn Shop find last month, Couldn't pass it up..
Headknockers Model 19-5 AUL92XX