I have no idea on valuation, but you can always run a "completed listings" search on Ebay. True G&H pulls a pretty penny, iirc. Consigning might be the right path forward here.
Solid SOLID find!
My size, too. I'll be watching that Ebay page, Mainy!
EDIT: Two stops today. Very recent mid-beige HF for Burberry SC, 2 btn, dual vent, excellent condition. 42L, fits generous in the pit. I have something similar that fits better, so available.