Your 575 looks like a custom order with what appears to be a Spruce top, single pickup, Block Inlays, and Bound Headstock. There's no photo of the back or sides to determine if it is Plain Maple or the upgraded Figured/Flame Maple. Is that an Ebony fretboard or the standard Rosewood? These options all add to the potential value. Check the inside label for other clues.
Also, no mention about the condition, but it looks great. The market for archtops is softer than in previous years, but if you check Ebay and Reverb (sold prices) for H-575's that should give you a pretty good idea. The good news is that Heritage 575's all were solid wood (not laminate) constructed and considered high quality, hand made archtops.