@ R. W.
My answer has crossed Yours...

I think we both speak about the same dagger.
But I havn`t know that these scabbards (and so also the daggers) should have an shorter blade.
At the photos I can`t see that. But maybe.
It is a fact that these daggers were worn prior the known Postschutz -Leaders dagger.
But I think these daggers are also Leaders daggers -but an early version who were changed later to the known chained model.

I think there are no PS-EM daggers.

Best
medes

as Tom Johnson use to say:
"...the story is really theirs to tell" now we will do...