Going Rate KBNV-404SW

What is the going rate for a NIB KBNV-404SW Stainless Vaquero in 40 S&W, Ruger model 515?

Think saw a listing in the Ruger Reference for back in 2010 for this, but it was some time ago, and not certain what the current value would be.

Any help appreciated!

There are 2 variations of that gun.
One was for the San Diego PD & somewhere between 580 to 1000 were built. I think the ones sold to them were also engraved with a badge or something. The left over ones,, not marked for the PD,, were model 0515,, and were sold on the open market.
Not often seen or sold,, but desired by some collectors.
According to the latest RENE Price guide,, the PD marked ones; $650,, while the non-marked ones; $595.