Concorde G-BBDG (British development aircraft) fuel panel nut cover

Removed as part of the restoration of this aircraft, these come with a copy of the paperwork as shown, provided by Heritage Concorde who removed these. 
They were used to prevent fixing nuts from entering the fuel tanks.
Also come with certificate of authenticity.
Photographed here on the nose landing gear of G-BOAC at Manchester.
Price is for one- photo is example