You may be able to get the unit to show the serial number if you switch it on and press buttons 1 and 6 simultaneously. If no joy, try 2 and 6.
If you're successful, the display should show a serial number in the format M followed by six digits, or possibly V followed by six digits.
Otherwise, as Elekie has said, you need to release the radio from the dash and pull it forward. There will be a label on the case somewhere.
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