Original WWII US Rifle M1 Projector dated 1945 and WWII US HE United States Pineapple Grenade well stamped and signs Yellow and Yellow was the color code for HE (high explosive).
These items are extremely rare in any case and even more rare in this original condition. The grenade has provenance as it was dug up near the Gustav line in Italy in 2014 by a collector.
The original WW2 unfired 4 prong M1 projector is really rare to find.
Used offensively and launched from US rifles, this assembly was best utilised and designed for anti infantry attacks between throwing range and mortar range.