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Bitters were essentially Opels wrapped in stunning bodywork. There's nothing wrong with that. Opel running gear is strong and easy to get parts for (although you usually have to order them from Europe).
Erich Bitter was a professional cyclist (he competed in the Tour de France) before he turned to auto racing. He had a fairly successful 11 year career. After retiring from racing in 1969, he became the official German importer of Abarth and Intermeccanica.
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Bitter SCs are rare to begin with. Just 500 or so were built. Only 20 of those were Cabriolets.
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Bitter coupes can be found for less than $20K. This car, being a convertible and in very, very nice condition, has an asking price of $40K.
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A big thanks to Tamerlane for sending me the link to this car!