3-WAY PISTOL POWDER FLASK
- Source: eBay UK
An extra photo has been added with more detail.
I took this to an Antique Militaria shop. The gentleman examined it and explained it was an original piece from the 1850's. He also showed me a rifle that it may have been used with.
(I do not know what the black material is wrapped around the flask and it is not something I asked the dealer)