I think the brown car will fetch 90 000$.
If I look at Hagerty's valuation tool, this car is clearly a #2 car (for multiple incorrect details). Combined with an unpopular colour combo, etc., thus my 90k$ prediction. If I were to do a 280 SL with no history in order to maximize ROI with a sale in mind, I would say screw the original colour, pick the most popular int/ext colour combo, make it look and smell like new everywhere without worrying too much about the car being correct, and market it well.
I think this car is very well put together and will sell, but not for #1 car money. No way.
Jerome