War era liquor flasks

Cleaning out parents house and came across these bottles. Possibly my grandfather's that he brought back during the war? Not sure they were bought/made in USA. They are in French and cannot find ANY information about them. I've contacted Hennessy and they can't tell me how old the bottle is, but they did tell me to contact Christie's Auction House to find the rarety of the bottle. No info on Izarra that i can find, and Martell doesn't even have a "contact us" button on their page. Please help if you can. Would like to find a collector/buyer for these if the price is right!