Start with what the Jaguar 420 and Daimler Sovereign is: a 4-door notchback saloon with 4.2 , built from 1966 to 1969, in the decade that gave the world the pony car and the mid-engined supercar. What it meant takes a little longer.
How it came about
The Jaguar 420 (pronounced "four-twenty") and its Daimler Sovereign equivalent were introduced at the October 1966 London Motor Show and produced for two years as the ultimate expression of a series of "compact sporting saloons" offered by Jaguar throughout that decade, all of which shared the same wheelbase.
Developed from the Jaguar S-Type, the 420 cost around £200 more than that model and effectively ended buyer interest in it, although the S-Type continued to be sold alongside the 420/Sovereign until both were supplanted by the Jaguar XJ6 late in 1968.
The hardware
The engine is 4.2 . On the scales it comes to 1676 kg. Drive goes through a 4-speed Manual transmission / manual (Jaguar only) / 4-speed manual with Overdrive (mechanics) / overdrive / 3-speed Borg-Warner 35 transmission / Borg-Warner 35 Automatic transmis. The layout matters: a front engine drives the rear wheels, the classic proportion — long bonnet, cabin set back — that most people picture when they picture a sports saloon or a grand tourer. The wheelbase is 2727 mm. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Family and rivals
In the Jaguar line-up the Jaguar 420 and Daimler Sovereign has a clear place: it replaced the Jaguar S-Type; it handed the line to the Jaguar XJ6; the factory was Coventry, United Kingdom. The cars a buyer would have weighed it against include the Alfa Romeo Spider, the Toyota Corolla, the Dodge Charger. Its Jaguar stablemates include the F-Type and the Vanden Plas.
Owning one today
There is no federal ownership record for the Jaguar 420 and Daimler Sovereign — it predates the complaint database or was never sold in the United States — so MotorJury publishes no running-cost figure for it. For a car of this age the price is set by the collector market and the condition of the individual example, not by a formula.