I bought this Kepi from a Flea Market near Toulouse.
I have no idea about it although Ive found something not dissimlar via Wickipedia its better to talk to people who have interest in this sort of thing and may be able to enlightem me further to its authenticity.
I can email photographs as have had little success posting on here.
The cap its dark blue with red piping and the red grenade type feather badge on the front. Black plastic front with plastic belt acriss, The top of the hat is plain dark blue not red as you see in many pictures..
here is a link for the closest I have gotten to how this hat looks online.
File:KÚpi troupe de marine de caporal - chef ou de sergent.JPG - Wikipedia, the free encyclopedia