I have a Browning BDA .45 (sig P220) that I bought in 1980. It has the heel magazine release. Yours has the pushbutton mag release and the slightly recontoured grip frame that was, in the US, referred to as the P220 "American" when it was originally released.
I don't remember exactly when that was, for some reason I was thinking it was in the 90s, but apparently not, since your gun was made in 86. Maybe yours is one of the early ones???
Nice score excellent price. My BDA is the best stock .45acp I've ever had, and its still 100% stock today. (there is some wear ). I'm a Colt Govt model/1911A1 guy, generally, but the BDA opened my eyes and in several ways, its a better gun than a standard Govt Model.
My .45 P220, which the seller thought may have been a Michigan LEO piece is from 2002 and is hybrid, German stamped slide and US frame (no proof marks).
Very very nice! My P220 is one of my very favorite pistols, both to shoot and to just look at on days when the range beckons but is out of reach for whatever reason!
Got mine in '87 and carried it for years as a duty sidearm. Night of the King Riots I began carrying two extra spare magazines and got a four magazine pouch. That gave me 41 rounds.
Not really a complaint, but when my extractor broke, Sig wanted me to send it to their custom shop for replacement. I told them I was trained by Sig as an armorer and could do it myself. Nope. I told them I was trained as a gunsmith at Trinidad. They still said nope. They wanted work for their custom shop. I finally found another supplier. Apart from followers (to convert the seven round magazines to eight rounds) and sights (night sights from Sig), that's about the only part I ever replaced.