Here is a constantly changing list of the most valuable French stamps and overprints with proofs of sale.
1. $23,100.00, France. May 2006, Cherrystone auction. 1859 10c Postage Due, original gum, Calves cert. (J1, cat. &;euro 32,500)
2. $21,850.00, Fezzan. January 2010, Cherrystone auction. Fezzan 1943 Postage Dues, surcharged 5fr on 1L orange.
3. $17,250.00, France. March 2007, Cherrystone auction. 1849-50 Ceres, 15c green, original gum.
4. $16,100.00, France. March 2007, Cherrystone auction. 1870-71 20c blue, type I, Report I, original gum (#43, €24,000).
5. $13,750.00, France. May 2006, Cherrystone auction. 1849 1fr “vermilion vif”, von der Weid cert. (YT 7, cat.&;euro; 25,000).
Check out the US based French stamps online shop – FrenchPhilately.com