Stores reference 10A/7063. 'Receivers, telephone, head, type C' as used with the Type B flying helmet and Type D oxygen mask. Manufactured in plastic/bakelite moulded over a steel shell with a separate screw on bakelite cover. Some surface scratching and knocks to the main casings and covers. Very clean internally. Complete with both metal inserts. Remarkably difficult to find now. Good used condition overall. Stock code H24457B.