wheels coupled to gas-charged shock absorbers, and an independent coil-over-shock absorber setup coupled to semi-trailing arms at the rear. All 600 models had 3-synchro (no synchro on 1st) 4-speed transaxles. Unlike the Volkswagen Beetle or Fiat 500, the Fiat 600 is water-cooled with an ample cabin heater and, while cooling is generally adequate, for high-power modified versions a front-mounted radiator or oil cooler is needed to complement the rear-mounted radiator. All models of the 600 had generators with mechanical external regulators. The top speed ranged from empty with the 633 cc inline-four engine to with the 767 cc version. The car had good ventilation and defrosting systems. A year after its debut, in 1956, a soft-top version was introduced, as well as a six-seater variant—the Fiat 600 Multipla. It was a precursor of current multi-purpose vehicles. The millionth 600 was produced in February 1961, less than six years after the car's launch. At the time when the millionth car was produced, the manufacturer reported it was producing the car at the then remarkable rate of 1,000 a day. As of mid 2017 there were 78 registered as taxed for road use in the UK and 44 registered as SORN (Statutory Off Road Notification). Foreign production SEAT 600/800 In Spain, the 600 model was made under the make of SEAT, from 1957 to 1973. Up to 797,319 SEAT 600 were made. The Spanish car maker exported them to a number of countries worldwide. SEAT produced various derivatives of the original 600 model some of them with improvements and special fittings like the use of "suicide doors": the SEAT 600 D/E/L Especial an luxury version, the 'Descapotable' cabriolet, the 'Formicheta' commercial version, the 'Múltiple', the 'Savio', the 'Playera', etc. The most interesting version produced between 1964 and 1967 by SEAT is the SEAT 800, the sole four-door derivative of the 600 model which received a longer wheelbase. It was developed in-house by SEAT and produced exclusively by the Spanish car maker without any equivalent model in Fiat's range. In addition, in Spain many car bodybuilders or companies associated with SEAT, manufactured several versions derived from the 600: ?750 Primavera', 'Rany', 'Milton', 'Serra', 'Gredos', 'Avia 50', 'Buggy', 'Siata Minivan', 'Siata Tarraca', etc. The SEAT 600 was the most popular car in Spain of the twentieth century, because it was the first car that any Spaniard could buy and served to definitively motorize the