is one of the brand’s funniest looking cars ever, with a rounded rear and greenhouse paired with a long, low nose that features uncovered pop-out headlights, giving the car a lovable frog-like look. Porsche sold more than 61,000 cars from 1977 to 1995, and has become one of its most beloved models. At , which kicks off week and the European auction season, maybe the rarest Porsche 928 of them all is going up for sale.

This is the only 928 ever produced with a fitted by the Sonderwunsch team, the even more special arm of Porsche’s Exclusive division that creates custom specs and designs for customers. The slantnose was a pretty popular and iconic option on the G-body 911 (and the 964 that came next), with some having normal pop-up headlights and others getting 928-style exposed lights.

Honestly, the Flachbau front on this 928 is giving uncanny valley. The only difference in terms of design is the fitment of traditional pop-up lights — the front bumper and hood and the same as a normal 928, and the front fenders are otherwise unchanged too. Especially because this is the only one without it, I’m so used to the 928's froggy face that the Flachbau just seems wrong. Like, it looks good and awesome, but it’s a bit unsettling.

In addition to the slantnose, this 928 is fitted with special options like more aerodynamic side mirrors, deep-dish wheel spacers and wider rear fenders and side skirts. Only 2,078 928 GT models were made, with the GT getting more power and standard equipment.

What makes this 928 especially cool is that it’s being sold by the original owner, who custom-ordered the car almost 35 years ago. At the time of listing the 928 Flachbau’s odometer shows 35,912 miles, though the odometer was replaced in 2003 when the car had 7,146 miles. RM Sotheby’s is estimating the sale at €180,000 to €280,000, but when it comes to a one-off Porsche, you never know what will happen.