Here is mine, which has the same S-Mark and below U1-Mark.
Further it is painted light-blue (like the early past WW2 US) over what I would identify as authentic Oliv-Drab.
Note also the remains Yellow-Ring at the neck - with the Oliv-Drab as markers for a live-genade.
Having a look to the bottom You´ll recognize the pressure-release-hole of ...mm Diameter, which
is drillled quite out of Center.
The completly damaged fuze came with the grenade and I really had to use all the tricks to get it
removed. Since the fuze was messed up before I didn´t really care... . Remarkable is that the
Material of the fuze is what I think past war and much harder and different in consistancy than
the WW2-fuze-material.
As total it brings me to the assumption that the gren. is US-made. Started it´s life as Live-gren late ww2,
and had been transferred after war to Practice.





Cheers,
Ralf
p.s.: all shown materials are 100% INERT and FFE