Go to "traderonline.com". I put in a search for 380 SL's and 15 came up. Around 5 were between 84 and 85 with 30 something thousand miles on it . The price range was about $15,000 - $23,000 like what I expected. The price drops considerable when approaching 100,000 miles however. Those prices are a good representation of the market value.

If you can find a Mercedes convertible period in the shape you are talking about from the early 70s to 80s < $10k JUMP ON IT! I never have seen a MB convertible in tip top shape , < 50 k miles, < 10 grand. Never. But I am sure there are always firsts out there. Just my $0.02.

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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)