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Ren Wax is a great choice. As far as the leather, I would leave it untouched. I've actually heard that linseed oil will cause the leather to deteriorate faster...

I think a lot of the texture is rust bubbles but there certainly could have been a rough textured coat of camo on it. I would think more sand than woodchip.

Looks like an early M35 with single band aluminum liner. I see what may be early apple green paint but oddly I see not decals.

Some helmets and leather are preserved very well. Depends on the...