Just about all of these old liards from Louis XIV (L XIIII) are pretty worn and beat up. If you find one in decent condition, it is a valuable piece. The worn ones are not too valuable.
There are dozens and dozens of mint marks and 'privy marks' associated with these coins. To get a thorough listing, you must consult a coin catalog. (Most libraries have them.) The crowned L mint mark that requester Hicks mentions is from Lille and is generally more rare than other mint marks. The catalogs list Mr. Hicks' coin at $60 US dollars in average circulated (VF-20) condition.
We can give only rough approximations in this CoinQuest forum. Here are typical catalog values averaged across all dates and marks:
worn: $12 US dollars approximate catalog value
average circulated: $75
well preserved: $400
Catalog values are inflated values. See our Important Terminology page for an thorough explanation.