I picked one up the other day. 5906 with square trigger guard and adjustable sights. If been wondering how old it is. It came with what looks like a holster that A LEO would wear. It even says " The Cop " on the back of the holster. I will be posting my serial number along with pictures later today if someone can help me out to find when it was made/ used. I absolutely love the gun. It's more accurate than my 92fs which I though was a tack driver. It has absolutely no kick at all, I though my first round I shot was a squib.
Whoever had it before me put a flat grey duracoat on it, while leaving the ears of the sights, safety, mag release, etc all stainless. Looks beautiful.
ANYWAYS.. Sorry for rambling.