Stores ref. 6F/154 (tubes). Used for communication between pilot and co-pilot - usually within biplane cockpits. The fabric covered flexible metal tubes are in very good condition bar minor fraying at one end (see photos). The main alloy socket is stamped 6F/154. The earpieces are of the larger 'flat' chromed metal type, marked 'DH Type Earphone' and are in good used condition. Stock code H15762.