I am speculating that the OP's knife as well as the example posted by Killgar may possibly be models intended
for the Russian market. If I rememver correctly, knives exceeding a certain blade length are not permitted to
have full guards or they will be classed as "cold weapons" which iare regulated and requires a permit.
As for the OP's Warrior, I see nothing to suggest it is not authentic. I do not know if it is a "prototype". But I can attest to the existence of rare but occasional models of factory knives out of Seki that are unmarked or not fully marked as they should be. This "might" be such an example. Would ne interestig to see if any further information can be uncovered.