if it really is original, congratulations.
Put it up for auction and you'll get a car's worth for it.
Or have a look in auction archives/past lots at christies, sothebys or antiquorum.
Prices are higher for less polished specimen,
so i would only have the movement overhauled for 840€ at JLC,
and please, please take it out of the drawer and put it in a pouch, or a safe.
Cheers, m