Despite a general cooling off in the collector car market, a few recent sales have bucked that trend in a surprising way. And it’s hard to say if they’re genuine outliers, too: each example below has a certain quality or characteristic that can help explain its sale price, but some make more sense than others. To wit, a Ferrari that just a few years ago seemed like any garden variety mid-engined exotic sold for nearly half a million dollars.

For this case, we can thank the surge of demand for cars with manual transmissions, but comparable examples over the past year have sold for much less. An unloved but low-production 911 from the ’80s just went for over $300,000. A Mercedes 280 SL for more than $200,000. And a build slot, an opportunity to buy an HWA EVO, not even a physical car, went for almost twice the car’s starting price.

The car auction market has become more transparent in recent years with sites like Bring a Trailer, which you can use to give you a rough idea of how much a car’s worth has risen or fallen over time, along with the opinions of internet commenters who think that a given car is overvalued or undervalued or valued just right or “well-bought.” As a rule, cars are terrible investments, which hasn’t stopped many people from investing in them and probably never will. All of which makes the secondary market a fascinating thing to study. Let’s get into the details.