The Waltham Wrist Compass had a brass case and a one-piece nylon strap. The compass points and needle were illuminated by radioactive vials, which depleted after several years. It was issued to a few thousand infantrymen late in the Vietnam War1 and was a component of the leg holster survival kit. However, like the Lensatic Compass, it was not waterproof.
1. Jungle Snafus...and Remedies by Cresson H. Kearny (Oregon Institute Of Science And Medicine 1996)