Rare Sailors Souvenier Shell Art Bubble Glass Diorama

Description

Behold this gorgeous sailor's souvenier shell art diorama.
These are extremely rare. I was lucky to find this at a local estate sale recently.  This was part of a lot the owner bought years ago from the auction house Christie's, see the sticker on the back.
Before I saw this at the estate sale I had never seen one of these Victorian shell art pieces.  During the Victorian era sailors bought them to give to their wives or girlfriends.
This diorama is in very good shape. Inside the bubble glass is coral, shell, and a maritime picture. The shells lining the diorama appear unbroken and intact. The back is wood.  Please inspect pictures. The piece measures 7.5" wide x 6.25" long.
Any questions just ask! Thanks, Heidi