Commenters treat the open cars as a different asset class from the fixed-roof coupes, with the same basic body worth many times more as a factory cabriolet. This drives persistent talk of coupe-to-cabriolet conversions, which the community regards as inherently worth less than genuine cars.
Coupe versus cabriolet: the value chasm
Mercedes-Benz W111 Coupe / Cabriolet · market