The serial number matches on the slide, barrel, and frame. JK Code (1989), Made in West Germany & imported to SigArms Inc in Herndon, VA
Have the exact same gun, but manufactured in 1987. I bought it used at the old B&B guns in Westminster sometime in 1995 or 1996. Gun shoots like a champ, and beside my 1994 Sig P229, they are the only Sig's I own.