Quoted:
... Turns out it is an 87 model. ...
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As in 1987, no doubt. Presumably in has either “Herndon Virginia” or “Chantilly Virginia” on the slide.
Sig 226’s of that vintage had an occasional problem with frame rail cracking. The best way to determine if this one has that problem is to remove the locking insert, which is rather involved, and inspect the inside of the frame.
If you can’t do this, at an absolute minimum you should remove the slide and look [b]closely[/b] for any longitudinal cracks along the frame rails in the vicinity of the slide’s ejection port – especially on the right side.
These cracks are hard to see. The firearm will function with these cracks, however, these cracks will grow!
Incidentally, you can also get an idea of a 226’s age – assuming the slide is original – by the proof marks along the bottom of the slide near the muzzle.
Sig finishes of that era were notoriously poor. The fact that this one has a good finish means it was used little or has been refinished.
Further, when looking for wear, check the two lugs along the bottom of the barrel (one is the feed ramp and one is a cam that locks the barrel into the slide when in battery. These get beat up pretty easily so at least some wear is almost guaranteed.
Also look at the hammer – the slide will quickly wear a small groove in the top, front edge of it.
Personally I wouldn’t get a 226 this old unless you’re getting a really good price for it, which you aren't.