But these nose flutes are already "Trophy USA" branded (not "Gretsch" anymore, and not "Trophy Music Co." yet). They belong to the first series of Grover-Trophy Humanatones. On the back side, they mention the patent number, but no "Made in USA" as they have been doing since.
(Left: the 60's model, Right: current one):
Look and feel the different qualities of plastic :
and hear it: first the polypropylene falling on my desk, then the polystyrene :