Hi Amilcar I don't know about this lid as I collect German only but welcome to the forum!
This helmet is a "reconstruction". The lion is of the M31 pattern and was of course not fitted on a M15. The liner looks very new as do the corrugated parts. The strap looks ok, but for a post war helmet. The French straps were very flimsy and were replaced post WW1. The layer of paint is of a very new quality. To my mind nothing survives for nearly 100 years in such a condition, not even me.
Look at this Belgian site. In Dutch (and some French) but the pics tell their own story. Frameset Go to the menu on the left and click on "hoofddeksels", then choose "helm" and click on the Adrian M15 or M2? or Adrian M31.
Last edited by emileverbunt; 06-29-2012 at 09:59 AM. Reason: additional info
Badge, paint, liner and chinstrap are all recently added to this helmet.