I only know of them being used on No.67 or No.32 Mk.4 scopes as used in this picture http://bcoy1cpb.pacdat.net/Korea_-_P...Mk_I_scope.jpg
http://www.ebay.co.uk/itm/WW2-BRITIS...cAAOSwcBhWYJ-N
I only know of them being used on No.67 or No.32 Mk.4 scopes as used in this picture http://bcoy1cpb.pacdat.net/Korea_-_P...Mk_I_scope.jpg
http://www.ebay.co.uk/itm/WW2-BRITIS...cAAOSwcBhWYJ-N