Is this a French WW1 Medics forage cap?

[RelicHunter]

Can't tell if its artillery or medical, don't have enough references for the piping color. Also, does it look like a good one?

[RelicHunter]

Nevermind, I figured it out.

Must be a 1918 model artillery forage cap (bonnet de police). But since these were used into the 20's, without a marking there's no telling its WW1 issue.

[FESTUNGBREST]

Os cap

That is not a french Colonial Mustard color wool. Nor is it Metropolitan HB WWI or Post WWI Bleu Horizon. It is not WWII M35 Khaki wool.
Artillery sours he's are Red in the French Military.