Antique c.1790-1800 2 French Portrait Miniature Sisters in Superb 18k Gold Locket Frame 2.5" Plus Bale Museum But I've never seen anything

But I've never seen anything like this

No chips or damage to the inkwells that I can see

The box has a tiniest fine tight hairline at side of the box's lid

Fabulous & rare antique French Georgian or Napoleon I era c

Antique c.1790-1800 2 French Portrait Miniature Sisters in Superb 18k Gold Locket Frame 2.5" Plus Bale Museum But I've never seen anythingA gold test affirms the pristine large locket type frame to be 18k gold. I would expect to find a French gold mark, tiny as they are, but it might be on the inner lip of this oyster shaped double sided old treasure, and it's not wanting to easily separate to open for me for additional exploration of the pendant, nor to allow more clear photos of these 2 magnificent portraits. I hesitate to pry, not wanting to leave a mark on the gold. It is sometimes