Size medium. Dated 4/66. Fitted with the smaller plastic Amplivox 13100 microphone. The rubber is in excellent used condition with only minor cracking around the microphone retaining wire and expiratory valve. The pearl grey chamois lining has average soiling and some illegible writing. Good reasonably clean harness that retains elasticity. Excellent microphone, loom and socket. A very good example retaining excellent overall shape. Stock code O17270.