This scabbard is dated to approximately the time period of the American Revolution-pre Battle of 1812. It is designed to hold the bayonet made to fit the British Brown Bess musket. The brass tip was very common in scabbards of this time, but was replaced around 1790 by a chape, which is a brass triangle put directly over the top of the tip, as compared to the original brass tip which was glued directly inside. The change in design was brought about by the complaints of the infantry soldiers as their bayonets became exposed due to the fallout of the tip.
The book "Proceedings of the Board of Ordinance," has a passage which states;
"Lieutenant Holloway who was ordered to take the field with a detachment of the Company of Royal Military Artificers and Labourers had reported . . . that the men found much inconvenience from the scabbards of their bayonets being pointed with a button instead of a chape as they frequently broke off, destroyed the leather, and left the point bare, and therefore requested that 94 musquett (sic)bayonet scabbards with long brass chapes might be sent to them, similar to those issued to the 1st and 4th Battalions of Artillery." (Strachan, 303)
This passage shows why the new fashion of this same design of scabbard was needed. This older version for the Brown Bess had basically taken out service by the time that the War of 1812 had occurred.
Hew Strachan British Military Uniforms 1768-96: The Dress of the British Army From Official Sources, 1975