The throat and tip mounts are made of a very heavy gauge of sheet brass and the body is a dark brown (possibly once black) leather.  The overall length of the scabbard is approximately 523 millimeters and it appears to curve to the shape of the yataghan blade it was found with.  The front side of the leather shows a single line on both edges that runs the length of the leather.  The back side of the leather is finely stitched in the center.  

The throat mount is 75 millimeters long and the width tapers from 42 to 40 millimeters.  The blade side of the throat mount is open and the leather body runs fully to the edge of the brass.  The leather side of the throat mount has a double scalloped edge on the front and back.  There is an 18.5 millimeter wide domed brass frog stud in the center of the front side of the throat mount.

The tip mount is 77 millimeters long and tapers from 30 to 19 millimeters in width.  The leather side of the tip mount lightly curves outward on both sides.  The end of the tip mount is open without any signs of a previously existing finial.  

Both the throat and tip mounts have two holes, only on the back side, where a brass staple was inserted to hold the mounts to the leather. 

Three examples have been recorded.  One was found with a Colt M1855 Revolving Rifle Bayonet, one was found with an Unknown Confederate Bayonet and the third is listed in Albert Hardin's book "The American Bayonet 1776/1964" as reference 111, with what appears to be an unknown post war bayonet.  

The scabbard pictured below, nicely fits the bayonet and appears to have been associated with the bayonet for some time. 

Information from other sources

Albert N. Hardin, The American Bayonet 1776/1964, Reference 111, shows an example of this scabbard with a bayonet labelled as "Unknown".  Hardin states "The flat nosed tip is ..." thus implying that the tip mount is closed on this example.

Speculation and questions