If you have proof of ownership, A Ford dealer can probably help you with the code based on vin number. While I am not familiar with Ford vin numbers the number you have given is not likely to be the to be the vin number that is on your registration or the driver door mfg, plate. The Ford dealer will look up the vin on their system to find the radio code, most likely for free.
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5323
M683890 code is 5323
Ford Radio Codes emailed to you from this site: FORD RADIO CODE United Kingdom Gumtree
If you have proof of ownership, A Ford dealer can probably help you with the code based on vin number. While I am not familiar with Ford vin numbers the number you have given is not likely to be the to be the vin number that is on your registration or the driver door mfg, plate. The Ford dealer will look up the vin on their system to find the radio code, most likely for free.