In 1963 the then Postverket (Swedish Mail) needed a new vehicle for mail delivery, and contacted Kalmar Verkstad, who developed and built it between 1969 and 1971. On the export market it was simply called Kalmar. In addition to the generous heating provided by the air-cooled engine, to provide appropriate heating for postmen, some units were fitted with a gasoline-powered Eberspächer heater under the driver's seat, with a dedicated exhaust pipe.
"Tjorven" was a nickname given to the Kalmar as its rather frumpy appearance was reminiscent of a contemporary Swedish television character of that name.
It was RHD for easy driver access to road side letter boxes, frame-built with a fiberglass bodywork.
Production ended in 1972 with about 2000 built, most of them for mail delivery.
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