Being a total newbie, this "German" shaped helmet appears to be an M40. The air vent is pressed and the helmet edges are rolled over. It has 2 extra rivets. Five rivets in total and the three rivets where a German helmet would have them are fitted with washers. (to cover the larger hole). The paint is a dark green, with what appears to be a lighter green underneath. There are no decals or markings that I can see. It is certainly not a light weight helmet. The lining has 10 lobes and is made of a very pale coloured leather. Is the helmet re-furbished or fake ?

Any help appreciated.
Thanks.