This is most certainly one the best know and easy to find French helmets Gueneau 313, it is made of glass fiber, it has 6 airing holes, 2 leather straps with press studs to hold the glasses and a free chin straps. This chin straps is held by 2 rings fixed on the helmet ( chin strap is missing),Made by Gueneau, helmet 313 was used at the beginning of the 60’s both in the Air force and the fleet Air Arm ,this helmet is complete with original 313 M 1 Inner helmet without communication,cable and plugs !!!!,helmet Head circumference is 56 cm = Medium -Large ,inner helmet Head circumference is 57cm = Medium -Large ,all in very good to exellellent condition,