The Mark X, later known as the Jaguar 420G, served as the flagship saloon car for the British manufacturer Jaguar from 1961 to 1970. Launched just a year after the legendary Jaguar E-Type sports car, the Mark X utilized many of the advanced technologies, innovations, and specifications that made the E-Type famous. Unlike its predecessor, the MK IX, the Mark X featured modern integrated unitary bodywork—the largest of its kind in the UK during that era—along with revolutionary four-wheel disc brakes and Jaguar's independent rear suspension, which were groundbreaking for British luxury cars of the early 1960s.

Initially equipped with a 3. 8-litre engine, which was also utilized in the E-Type, the Mark X later transitioned to a more powerful 4. 2-litre engine, coinciding with the introduction of an innovative all-synchromesh four-speed gearbox. The braking system of this substantial vehicle relied on power-assisted four-wheel disc brakes, with the rear brakes cleverly mounted inboard next to the differential for improved performance.

According to the Jaguar Heritage Certificate, chassis number 1D 75052 BW of this exquisite left-hand drive (LHD) model left the Coventry factory on August 18, 1964. It was ordered through the official German distributor, Peter Lindner, in Frankfurt-am-Main. The car has a distinguished history, having been owned by the notable Max Dietl from Munich, who was featured in the renowned German magazine "Der Spiegel" in 1964, where his vehicle was mentioned.

Since 2010, three additional German owners have enjoyed this splendid car, which now shows an indicated total of 87, 800 kilometers—likely the original mileage. Today, this model is a rare gem and a true survivor, even more so as a genuine example originally supplied in Germany. It is currently registered with Historical Status and comes complete with a new roadworthiness TÜV and inspection, making it ready for the road.