caliber? night sights? grips?
You have a Pic? Might help. Pry between 450 - 600 maybe depending on other details
Although hacksawfg may have gone a little higher than I would've on a NIB P226, he did get a couple extra mags with it. I think a very, very nice or NIB W.German P226 would command up to $700, maybe even $750. In the picture you show, I see what could be some cosmetic issues, but it's always hard to judge from a picture. $500ish?
I paid $800 for a mint condition German P226
I just picked up a 89 West german 226 in like new condition wiht extra mags, box and paperwork for 600.