Although not motorcycle or vintage this HJC/Parker Pumper Off Road Racing Helmet is pretty interesting. It is a HJC model CS12 that is Snell approved. As you can see it has the neck piece that is attached with Velcro that fits down into the racing suit.
From the side you can see the fresh air port that would have a hose attached to it in the truck, it gets dusty at 120 mph out in the desert. The cable connector you see is for communications, the speaker and mic are inside the helmet.
SNORE Battle at Primm sticker.
Here is a complete shot of the neck piece.
Looking inside the helmet the mic is visible, the speaker is tucked inside the padding.
