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American Motors Serial Number Identification
1949-1956 All Models. The car serial number is found on a stainless steel plate welded to the upper cowl area
under the hood.
Example: R-742901
First Digit - Series (Note: Two digit serial number prefixes for 1949-1955 models ending in "C" indicate
El Segundo, California manufacture) 
Second or Third through Fifth, Sixth or Seventh Digits - Sequential Serial Number