The contract cap is a pre war manufacture or just beginning of the war, a Reich command for all NCO and soldiers and all the WH-SS-LUFT branch.
The aspect of this kind of cap is simple : a orange color interior, with a regimental stamp under the sweatband, a "Trikot" wool, and a narrow piping color.

I post 2 contract caps here, with 2 different style about the wool, interior and piping very similar.
first a early Waffen ss grey cap with a very narrow pipe and black band, wool unusual, a kind of Grey Doeskin…
insignia skull Overhoff and late eagle in zink

The second cap is very similar, Trikot wool, narrow piping ( 1938 cap ) usual green band, alu insignias added in period.

this both is interesting for more reasons, the piping evolution in the III Reich era, manufacture, color and makers…

please, contribute with your pre war contract cap here, very interesting for our knowledge !

thanks for your time
Sebastien.