The XK120 wasn't mass produced until 1949 and came out as a 1950 model. The first 200 came off the line with aluminum bodies and had an emblem attached to the passenger dash stating the vehicle was an exact replica of the car that set a sustained speed record of 134 mph at LeMans in 1948.
Correction: The 1948 Jaguar XK 120 was actually a modified prototype 1948 XK 100 (100 inch wheelbase, four cylinder) Sports Car in which the XK 120, overhead cam, six cylinder engine intended for the 120 inch wheelbase Mark V Sedan was fitted for the 124.6 MPH two way record run in Belgium, in 1949. There is no record of it being sold.
The great public interest in the car required Jaguar to cancel using the XK 120 six in the sedan, which went into production with the Mark IV pushrod six in April 1949. The few XK 100s already built were promptly modified into 102 inch wheelbase XK 120 Super Sports cars; largely for racing purposes from 1949 on.
There were 240 of these largely handmade light alloy (aluminum) bodied XK 120 models made between July 1949 and January 1950. Mass produced XK 120 models with largely steel bodies were made from February 1950 to September 1954.
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It can cost anywhere from $50. to $120
It cost me 120 for part and 120 for labor
about $120-$400
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120 each
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it will cost about 100 pounds