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. This pair is mismatched in that one has 'square' edges while the other has 'rounded' edges. Some surface scratching to main casings & covers. Very clean internally. Complete with both metal and cellulose acetate inserts. Remarkably difficult to find now. Good '+' used condition overall. Stock code H16575.