Stores ref. 10A/7063. Pair of receivers (correctly, 'receivers, telephone, head, type C') as used with B-type flying helmet & Type D oxygen mask. Maunufactured in plastic/bakelite moulded over a steel shell with a separate screw on bakelite cover. Surface scratching and marking but a good used matched pair. Remarkably difficult to find now. Stock code H15068.