The original early war m1935 Stahlhelm and m1938 Fallschirmjäger helmets of pre-war production batches (but still used in large quantities in the early war years) were in a light greenish Feldgrau shade - very much sought after by militaria collectors, and called "Apple Green" helmets.
It's a common mistake to paint early war German infantry figures with blueish grey helmets and - horror - early war Fallschirmjäger with non-existing blue helmets.

Cheers.