It is exceptionally clean under the hood. The patina that a car like this takes on after 17K miles. While it's not totally out of the realm to repaint a car with 17K miles, it always makes you want to wonder how much of it was repainted. If the owner stored it under a carport uncovered for 20+ years, you'd see the rust that's up underneath it now and it wouldn't be uncommon. Recall the car is 34 years old.
The front seat wear does appear a bit abby normal. But the rest of the interior looks very nice. But if I was going to go strictly from seat wear, and based on the cleanliness of my 85 442 interior after 60k miles, I'd guesstimate at least 35-40K miles. But if the tires had been on it since new, and assuming they're original tires, they'd be on the tread tell-tale bars by now. It's odd that the wear is on the edge of the seat like that. Or that's how it appears to me anyway.
Regardless, at the current price, it would make a great driver IMO. If you love the aerocoupes. I'm not against them, but I wouldn't seek one out to buy unless it made monetary sense to do so.