Royal Naval Patrol Service.

Small white metal sleeve qualification badge with brooch pin fitting and registration number to the reverse. A shark and two sea-mines on an anti-submarine net above the titles, " M S - A S " within a roped border surmounted by a Naval Crown. Worn by personnel stationed at the " Swallow's Nest " in Lowestoft Suffolk engaged on Mine-sweeping and Anti-Submarine duties.

Code: 25941