Wanna show you this very interesting knife, made by Alexander Coppel, Solingen.
This trench-knife is not attachable, (the press-catch is only indicated an d there´s no mortise in the pommel).
The knife show´s an, (staghorn-like), iron-casted grip.
The scabbard for sure wasn´t manufactured for this particular trench-knife but I think, knife and scabbard had seen action together !
The knife´s heavy used but IMO this is a seldom seen item !