Strange M3 knife with unknown blade?

[landsknechte]

This curious knife arrived in the mail a couple of days ago, and I'm still trying to make sense of it.

The specs:

Blade is 5 9/16" long.

As viewed from the top 3/16" thick at the thickest point.

1/4" from the back of the blade to the beginning of the fuller.

Fuller is 5/16" wide.

From fuller to edge is approx 3/8".

It seems to be a hair wider, and a little thicker than the M1905E1 bayonet I have to compare it against. Quite a bit shorter. Also, it doesn't fit into the M8 scabbard that the M1905E1 slides right into.

Any thoughts?

[coolldad]

it looks to be a cut down sword blade. common with the patton sword blades.

[landsknechte]

it looks to be a cut down sword blade. common with the patton sword blades.

The same thought has crossed my mind, but I can't figure out what it could be cut down from. The shape isn't right to be a cut down M1913 blade.

[bsweeney]

I'm thinking cut down bayonet