The FB 1605 NATO Survival Button Compass, also known as the Francis Barker SAS Survival Button Compass, is a tiny brass button compass that has a jeweled bearing and is built to full military specifications for survival use. This "brass button" compass is a standard NATO inventory item, NSN 6605 99 522 0223, as specified by the British Army. The FB 1605 NATO SAS Survival Button Compass has been designed to hold up under the harshest environments and during WWII, was even swallowed by military pilots during capture so that it could later be used as an escape compass. This SAS NATO Brass Button compass was also often sewn into clothes to prevent its loss and to ensure that its owner always had a compass available. Here at Best Glide ASE however, we recommend that you just slip this Brass NATO Button Compass in to your pocket, survival kit or flight bag. Specifications: * NATO Stock Number 6605 99 522 0223 * All brass and glass construction * North and south seeking luminous points * Niva tipped brass pivot When your life depends on it you need the best! Built to Military specifications and in-service worldwide, the Francis Barker model 1605 NATO button compass out performs all others in the most extreme situations. On the watchstrap, in your survival kit, weapon butt or sewn into your shirt, the Francis Barker NATO Survival Compass will get you home - count on it!