When Ferrari makes an open-top version of one of its V12 super-GTs, it typically comes in particularly low production numbers. Maranello only made 448 examples of the 550 Barchetta Pininfarina, 559 of the 575 Superamerica and 599 units of the 599 SA Aperta. What we have here, however, is not just the first F12 roadster we've seen yet, but also the most exclusive.

Called the F12 TRS, it's obviously based on the F12 Berlinetta, but with some key modifications. Not the least of which is the open-top body-style (which may or may not have a folding roof mechanism of some kind), coupled with some unique bodywork like a cowled rear deck and reshaped hood. But the TRS (which we can only assume is some tribute to the 250 Testa Rossa) is also said to pack an F1-derived KERS hybrid assist, presumably similar to the one in the LaFerrari – or more poignantly, in the 599 HY-KERS concept – to give the 6.3-liter V12 even more juice than the prodigious 730 horsepower it produces in stock Berlinetta form.

The vehicle, apparently spotted in the garage at the company's Fiorano test track, appears to be a one-off built by Ferrari's Special Projects division for one discerning and evidently very wealthy customer who is said to have paid $4.2 million for the privilege.