UNIDENTIFIED SCABBARD

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Can any members help me identify this scabbard that I recently bought ?
It is 55 cm long and 4 cm wide , with an internal mouth width of 3.5 cm . It wont quite fit my Baker bayonet ... the last 1 cm wont slide in , due not to length but to do with thickness of the blade at the top. Any ideas what it might be for ?

[Bryan.H]

Is it an British model 1856 Pioneer sidearm scabbard?

http://www.arms2armor.com/Swords/sappers1b.jpg

(image shamelessly copied from the internet in the interest of time saving and to generate discussion)

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Hi Bryan
It is similar though the chape is a different design, however I have tried one of these and it is to thick to fit in the top mount mouthpiece .