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. Surface wear, scratching and knocks to main casings. Both covers/caps are absent but most of the internal components appear complete. Dirty with some corrosion of internal parts and the case threads. Remarkably difficult to find now. Stock code HC-NIV.