Pics look great, I think you can get your $525 out of it, but probably not much more. I have seen some clean Gen 2 models sell for $450-$500 recently in my area, but they weren't quite as clean as yours.
GLOCK Certified Armorer, GSSF member, NRA Life Member
Currently: 17, 17L, 19x2, 20x2, 22x2, 23x6, 24x2, 34x2, 35+1, AA LE 17-22 on G31 frame, DDLES 9mm rifle and pistol
Have owned: 21, 26, 27, 29, 30, 31, 32, 33, 36, Olympic KGL9