That is not the stamp you are looking for. The format is wrong, probably a part number or other stamping. Look on the top of the frame rail between the driver upper control arm and the steering gear box. The same exact stamp will be on top of the driver frame rail under the cab. You are looking for an 8 digit stamp with the second digit being a letter.
Examples:
9S123456
9= 1969 (first digit is the year)
S= Saint louis assembly
123456= assembly sequence/partial VIN (6 digits only)
7A123456
7= 1967
A= Atlanta assembly
123456= assembly sequence/partial VIN
let us know what you find.
