The 17th Century Cambridge token of Will Bassett (W/D 15) shares the same obverse die as a Cowbridge, Wales piece (W/D 30). This was first noticed in 1963 and subsequent research at both ends of the claim have led to the conclusion that the Cambridge piece was manufactured in error and that a subsequent issue was made for Cowbridge. The evidence is revisited and after some initial doubts, a newly discovered piece conclusively attributes Will Bassett to Cowbridge in Wales.
BNS Research Blog 