Uff. Steinhoff / L 37833 B

Does anybody know which period and where a person named Steinhoff served at feldpostnummer L 37833 B?
In my collection is a German M35 helmet with 'Uff. Steinhoff L 37833 B' painted in white inside.

Thanks,
Ton

[Jaap Woortman]

Ton,

Fpnr. 37833

(28.2.1941-29.7.1941) 3. Staffel Jagdgeschwader 77,

(30.7.1941-28.2.1942) 3. Staffel Jagdgeschwader 5,

(23.4.1944-24.11.1944) 24.11.1944 11. Staffel Jagdgeschwader 6.

Jaap Woortman