Hi, Yerik:
Most likely not. It is more of a reversed sharpened tanto than a gladius, but the striaght triangle cut point may lead one to believe this to be the source. There are some modern seax/styled blades, like the wharncliffe or hawkbill.
This style with the straight clipped point is commonly called a "Broken Back Seax", and was most commonly found among the Anglo-saxons and Saxons (folk for the Seax -- Seaxons). The other european tribes used a more rounded approach to the clip point.
In the size reporoduced, here, this weould be a large general utility and camp version of a seax, which could also be a backup weapon. Seaxes in the 30-inch range are called langseaxes, and they were fierce and thick chopping blades.
Some old seaxes have a bit of forward curve to them like a Yangatan or Flyssa, perhaps to increase chopping potential.
Some later seaxes evolved and became indistinguishable from other single-edged knives of the period, like scottish dirks or ballock daggers.
The seax can be thought of as the Anglo-Saxon Bowie/survival knife.