Hello ,
In my professional opinion this is a modern copy that is made in England. I naively due to bad photos was burned on a similar example sold from Nottingham England from an E bay seller over 20 + years ago to the tune of $2000 . They make these helmets to current day. I am 100% sure this is a late 20th century modern copy. I had the same rivets on my helmet , nasal bar and leather exactly .I don't care what any so called experts say or references of fake helmets sold by reputable people and auctions , this helmet is modern for sure. It would be nice to see some knowledgeable people on this forum who actually own real objects rather than all the google experts that contribute b.s. info.