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I'm not sure if you ever got this resolved. But I have done a lot of research on th e51 F1 Vins and was looking fo rone site That explained production codes on rating plate. You have 3 places the VIN is located. First, it is stamped into the top of the frame just above the shock absorber mount. Second, there is a VIN plate onthe passenger side fire wall, and third, is the RATING plate on the glove box door. The VIN data the other guys have given you is correct for the SERIAL NUMBER on the rating plate. This will also be th enumber stamped on the frame. The MODEL number youare refering to is listed correctly. The "1" stands for 1951, the "R" is for truck; and the "C" is th enomenclature for the light duty 1/2 ton pick-up (F1) this "C" is used throughout the parts catalogues when refering to the F1. This is really picky, but semantically, there is no "Vehicle Identification Number" on these trucks. There are "Serial Numbers;" and "Model Numbers" Andf both may appear correctly on the truck. For Licensing and Registration purposes, the Serial Number on the frame should be used (and unless the glove box door or for that matter the cab - has been switched out) the serial number on the glove box ratin gplate should match it. If not, use the one stamped on the frame - it's there for good.
The Serial number decoding is listed on page VIII of the 1948-1952 Ford Chassis and Accessories Parts Catalogue
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