I have a black hardtop for a 1971 Mercedes 280SL (113 chassis) in perfect...
...condition. How much is it worth? When I say perfect I mean FLAWLESS! ;D
Originally used on a white 1971 280SL
Black gloss exterior and beige roof liner
Includes rear window defroster
All parts accounted for
That car is certainly worth a lot, but you haven't provided very much information. If it's been recently restored and professionally painted, and has most or all the original parts... I'd say you could get anywhere between $55,000 and $90,000. Again, it varies a ton. I'd get it professionally appraised.
That's a beautiful, rare car you have there, I'd think twice about selling it...