1799 half penny stamped London both sides.

[Guest bart]

A friend recently found this coin and we are curious as to why it has been stamped. Any suggestions?

Many thanks

Bart

[Chris Perkins]

Lots of coins from that time were stamps with adverts and names. I'm not sure what relevance 'LONDON' has though, but it has almost certainly be stamped by a 3rd party after the coin was made (in Birmingham).