I found one on an old farm several years ago. When I saw the back I thought it was some foreign coin at first. This is the info I found when I searched the web.
“ This is a well known alteration done outside the Mint as a scatological joke. The technique involves the use of a tool called a “graver”, that is used to “chase” the metal in the lettering into the desired shape. The metal is moved around by the tool to alter the “E” into a “U”. The word “One” is usually not altered”
So I’m not sure if it was a joke or a brothel token, but either way it is an unusual find. Congratulations, stay safe and keep swingin.