The chassis number on this 1996 McLaren F1 GTR Longtail is 19R, but in the order of production, this car is No. 1. It's the first longtail version of the GTR version of what many consider the greatest car ever made. Despite its track-intended build, it's road-legal, and it's currently up for sale in the United Kingdom.
The special nature of 19R goes beyond the fact of its birth order. This car was reportedly used as a development prototype for the entire run of GTR Longtails and participated in numerous Japanese races, including the Suzuka 1000km. According to the listing, it's also only one of two GTR Longtails in private ownership (Nick Mason owns the other), so this is likely one of few occasions in a lifetime when one will be available for purchase.
19R has another first under its belt, too. It was the first GTR Longtail to be converted to a road-legal specification. Gordon Murray, the designer of the F1, worked with Lanzante to turn the racecar version of the road car back into a road car. The unique F1 comes with a Gordon Murray Design book that documents the conversion, as well as the history of the car. All of the parts that were changed were also kept and come as part of a large spare parts package.
Although some might not see the value of the color scheme, McLaren painted it this way to draw attention to the differences between the GTR and the GTR Longtail. The vibrant markings exaggerate the changes and earned this car the nickname "Squiggles," according to Tom Hartley Jr.
If the paint scheme looks familiar, it might be because this car has been seen flexing its BMW Motorsport-sourced V12 at the Goodwood hillclimb (seen below). Via Road & Track, the 19R is listed without a price by Tom Hartley Jr.