Haha, Geez you are lucky aint you. Talk about a pot of gold! and to get them for free! They would look great on display at the arms and armour swap meet in cannington on the 17th.
I would say the electrolyses or even some rainex rustbuster. I have only restored helmets so dont take my word as gospel.
Man to get my hands on one of them! Fantastic
Bookmarks