Help ID Branch of Service for Officer's Hat

[KwK36]

Hello all,
At first I thought this was a Pioneer Officer's hat, but the piping seems to be too light of a green color. Any help in ID would be appreciated. Would like proper identification before selling.

[OSS]

Administration for me.

[pauke]

color

Ditto admin.

[KC1]

Looks like a nice early Admin visor, possibly an Erel.

[DonC]

Pionier have black Waffenfarbe. I concur with Admin.

Don