OK, that's close enough to 54mm to say that these are 54mm or 1/32 scale. They really do look to me like figures from a kit, like an armor kit, though I can't say that conclusively. The fact that they have no bases also makes me think of figures from a kit. Tamiya's figures come without bases, for example; the sprues include flat rectangular bases for the modeler to use if he chooses.
Are these figures of a hard or a soft plastic? Hard like styrene, or soft like the plastic Airfix uses for its figure sets?
Prost!
Brad