Sorry, tobystoy - I meant to post additional information for you, but your thread seems to have gotten lost in the pile.
Your "coin" isn't actually a coin, nor a commemorative medal, but a "jeton". Jetons were counters, originally made mainly for use on an abacus-like device known as a counting-board which helped people add up sums of money and do other complex calculations back when Roman numerals and non-decimal monetary units were normal. By the time of Napoleon's reign, the Revolution had swept aside the archaic monetary units, rendering counting-boards obsolete. Jetons were then mainly used as gambling tokens for cards, dice and other games of chance.
If your piece is indeed identical to the piece DCH linked to, then it does actually have a date: L'an 7 was the date using the Fench revolutionary calendar, equivalent to AD 1800.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis