Pot à Flanelles, these were gold toned canisters which held cotton balls used to sample parfum extraits at the Guerlain boutiques. As you can see in the photo below, the bases are the same shape as the Sucrier de Madame tester bottles, but have a lid with a disk shaped finial instead of a spray mechanism. The finial is emblazoned with the Guerlain double G monogram. The pot a flannel was engraved with the name of the parfum that would sit next to the canister.
These were not offered to the general public and are extremely rare to find when offered for sale. A nice piece to add to your Guerlain collection.
photo by ebay seller duhautmarais
photo by couteau bergarie