Series IV 1959 Metropolitan January 1959 saw the start of Metropolitan Series IV (NK4) production (Commencing with VIN E59048 on 12 January 1959). This major redesign saw the addition of an external decklid (previous models only allowed access to the trunk through the rear seat back) and vent windows. By this time, the engine had been upgraded by increasing the compression ratio from 7.2:1 to 8.3:1 (Commenced VIN E43116 — October 15, 1957) giving an output of 55 bhp (41 kW) (as used in the Austin A55 Cambridge). The additional features added 15 lb (6.8 kg) to the weight. Exterior color options were the same as for Series III. The interior now used a diamond pattern for the seats, with white vinyl trim. The MSRP for Series IV models was $1,672.60 (Hardtop) and $1,696.80 (Convertible).
Sales rose to 22,209 units in 1959, the Metropolitan’s best-selling year, promoting it to second place behind Volkswagen in sales of cars imported to the U.S. American Motors’ advertising made much of this ranking, while omitting mention that the Volkswagen outsold the Metropolitan by 5½ to 1. Production ceased in April 1961 (final VIN — E95981, built April 19, 1961). Sales of the existing inventory continued until March 1962. A station wagon version was contemplated by AMC, and two prototypes were built, but the project was abandoned. One of the two prototypes has been restored and is on display at a Metropolitan restoration facility in North Hollywood, California.
Approximately 95,000 Metropolitans were sold in the United States and Canada, makin