Art Nouveau Gold Tone Locket

This exquisite Art Nouveau gold tone locket also has a lovely chain.
There are minor dings and wear to front and some wear to the back. See closeups.
The chain is 26 inches long, metric 64 centimeters. There are two very old photographs inside, a young man and a lady. Two copper retaining rings keep photos in place.
Both chain and locket are unmarked.