German Nazi party “SS” double edged Combat trench dagger, with black painted aluminum Knuckle Bow guard with one S on each side, possibly a presentation piece, etched with engaged infantry scene and flanked by vertical open winged eagles on each side, standing on a swastika globe supported by oak leaves.Tang nut stripped of thread. Blade not abused, some wear to hilt but retains most black. Seems to be modelled after the M1918 US trench knife. No marks found. Date and origin not known.