RMS Franconia Ship In A Bottle Keychain Cunnard Line

Description

Nice vintage Franconia keychain souvenir.
I found out the top (the metal part ) will screw out of the black plastic.
There is a small rubber stopper with a hole.
I believe with a syringe water can be added.
I dont know if it was removed at one time or just evaporated.
Also not sure the water will stay but I don't see why not.