its called a love token.
you would scratch your sweethearts name on the coin and gift it
they actually ruined the value in today's numismatic standards
its not worth more than someone is willing to pay for it today
however, you have a nice piece of history which you can continue down the line as a family heirloom and that my friend is priceless
"A wise man speaks because he has something to say; a fool speaks because he has to say something"