Please help identify maker of vase - Signed on base - Possibly Longwy?

Hello, I have had this vase for about 10 years now and every now and again try and find who the vase is by but no luck yet. It is very like Longwy but has no Longwy mark. There is a monogram in the last photo which looks like G then possibly a D on its side with an A inside this? Also has number 304 A. There was an artist who worked for Longwy called A. Dominique GISQUEAU but don't know how he signed his pieces, could this monogram be his? Please notice the rim where it looks like folded pottery. A tall vase measuring 14" high. Based on the colour of the base rim and crackle in the glaze on the base I'm sure it has quite a bit of age. I would appreciate any help. Thanks.