Your description sounds like one of a limited series of specially outfitted or dealer specified H-575 Customs. You might ask the seller if the interior label states "Custom".
The "Custom" designation typically included one or more extra cost options such as upgraded colors, pearl block or slant fretboard inlays, bound neck, bound headstock, inlayed headstock and choice/upgraded wood packages. Since each selected option had a specific cost associated with it, the final selling price increased accordingly.
Back in the early years a few of the larger, high volume Heritage dealers ordered tricked out 575's and other models.
Today, the market for custom upgraded Heritage guitars tend to be on the higher side of the resale market. Check Reverb 'sold' for this model and you'll get a pretty good idea of the possible price range for the H575 you're considering.
Finally, thanks to Google, here's an example of an upgraded H575 Custom that might be similar to the one you are considering. As stated, this was a version that was included in the old Heritage Catalogue back in the day. Good luck!