Need help identifying pistol

[Va Hunter]

My father in law recently passed and my mother in law gave me his guns. I have a pepper box with the only markings on it are 1840 on one side and London on the other. No caliber marked anywhere. Here’s some pics as i know nothing about pepper boxes.

 

[2 shots]

looks like a display piece from the photos.

 

[Sam squanch]

Fake decoration.