Unfortunately, not a whole lot of value. Most of these used stamps are cataloged at $0.20 to $0.50 which means they are actually worth about $0.05 each. The Mint 373 (if it is actually Mint with gum on the back), is more in the $10.00 range, which, again, means that you could get about $3.00 for that one. Sorry that I couldn't give you any better news.
Heartily agree to both of these comments. I collect France also, and though not many of value, definitely enjoy the beauty of that countries offerings.
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