I saw this one for sale a few years back, at around 16K, and understandably values have gone up since then for these classic coupes. This particular car is not only rare due to it being a 140 series coupe, but it's also a rare early series car, badged as a 500 SEC (carrying the badging over from the previous series C126). There would only be a handful of these in the country. The seller noted a fair few issues with the car that need addressing at the time of sale, and it was asking $23,999 in December 2021. See the original advertisement here.
Here's what the seller noted in the original advertisement:
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