The theoretical value of a franc (now pegged to the euro) is now about a quarter.
To give some indication of the relative values at the time, the silver 5 francs coin from the 1960's contained just a little less silver than a US half dollar, so a franc should have been about equivalent to a dime.
Here's a pic on
on World Coin Gallery.
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