Look at these pictures from the norwegian
Digitalt Museum... it's a translucent plastic Humanatone! The current Humanatones are stamped on the front with "Trophy Music Co.". Here, you can read "Trophy U.S.A.". The plastic looks like polystyrene, and not polyvinyl chloride, as it is used now.
I suppose this is an intermediate model, between the Gretsch ones and the current Grover-Trophy production. When does it date of? Difficult to say, but probably early. Indeed, the nose flutes sold by the
Dr. B. B. Bumstead in the 1990's were already made in PVC and stamped "Trophy Music Co." Since I don't know when Gretsch sold the rights to Grover, I can't be much more precise. Is this nose flute from the 70's?