Sinclair added serial numbers to every C5 unit made, it can be found on a sticker on the vehicles's centre console facing up between the pedals. It is 13 characters long consisting of an initial "V" followed by 12 numbers. On the sticker there is a gap between the V and the numbers. Most people quote it without, either is fine here.
Sinclair C5 serial number:
Click herefor an idea of what a Sinclair C5 may be worth
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