Black M43 field cap with a cap badge for members of "Technischen Nothilfe" (TeNo). 
Interestingly, this black field cap comes with a Panzer-Pionier piping! The cap itself is designed identically like an M43 Panzer field cap.

Blue-lined, machine-woven TeNo cap eagle sewn by hand.

Black and white all-round piping on the top.
Black lacquered cap buttons, tight fitting.

Dark blue silk lining with normal signs of wear and age. Size stamp 57. No manufacturer's mark visible. 

Worn hat without damage with normal signs of wear and age.