The German button found on former Schlesig-Holstein battery in Hel (Poland)

[Szarski]

metall button with a diameter of 13 mm,

on which are: a gear, a hammer and a capital letter N.

I'm assuming it's a HJ or sapper organization button. help please... szarski@helmuzeum.pl

Edited June 3, 2023 by Szarski
no space

[Richard Auld]

TENO, Technische Nothilfe.

Rich