This conical flask has a silver bayonet or captured cap which is hallmarked Birmingham 1877. It is also stamped "GU" (George Unite). There is a small dent in the top of the cap and it is engraved "C.B.C."
The dark mahogany coloured case has a good patina. The girth strap has been extended - the stitching is very fine, so this was probably done in the late 19th / early 20th century. It is attached so that the flask will sit on the near-side of the saddle. The case closes with a billet fastening and has a replacement top strap which attaches the flask to the D ring of the saddle. It is lined in chamois or doeskin. The top of the case is embossed with the initials "J.A.B."
