Cord, CD-318. Extension cord used with the T-30 throatmicrophone. The microphone plug was inserted into the jack of the extension cord (JK-48). The cord has an inline 'push to talk' switch, SW141-V, and a black PL-68 'type' jackplug for connecting with the aircraft intercom. An adjustable leather strap was used to hang the extension cable around the airman's neck. This is an officially modified CD-308 in that the locking 'button' on the push to talk switch has been removed. Unused but a bit soiled as these were coated in chalk when packed. This just needs cleaning off with a damp cloth. With 1944 & April 1945 dates. Very good used condition. Stock code H23755.