Whether or not that is a reproduction decal you have a great looking helmet.  I’m no expert but I think the decal is real. The condition seems to match the helmet age.

Hello!?!?!

I really appreciate the feedback I received from all who provided input regarding the Katana I purchased. Presenting an item to forum members was backwards. I didnt spend much on it & received great input. Now that my ability to identify an NCO Katana I find I can't afford one (right now). Ya'll demonstrated the strength & level of knowledge forums like this bring to the table! 

On the rank insignia, it is determined that they are post war aluminum made types (from the chinese militaria group on facebook).

Is that design above the 221 a Nazi Eagle proof mark?   The e means it's a Herman Kohler "e" Late War part? Haven't found one like that with the eagle stamp yet.

Nice collection. I collect Legion Condor, so I'm partial to the LC plaque in the last photo 👍

Ugliest helmet ever made. I think the Soviet’s purposely made them for the Germans as a constant reminder to the Germans that Germany lost the war. 

That's great, just what i wanted to know. Vielen dank!

It's part of a vietnam era lot of stuff. I thought it might be a blank round but the Google Lens was bringing up foreign ammo links.  Could be. Thanks. 

Thanks for the direct and identification. Further search says the top two are: Medal "In Commemoration of the 800th Anniversary of Moscow"

When my Dad had a military funeral in 1972, the Marines fired volleys with their M-14s.  The cartridges looked like the one posted by the OP.    

It most likely is a "blank" US round. I found a handful of these as a kid, but can't find a good image.  I see US buttons in the background.