Bundesgrenzschutz Helmet #2 - BGS Stahlhelm - Bundesgrenzschutz Helmets are textured and are painted in different shades of green.

This is a M35/53 Bundesgrenzschutz ventless, the most common and last steel helmet version used by the BGS, These began production in 1961
This one has a BUND stamp behind the liner band that I have not seen on other BGS helmets