German WWII Kriegsmarine Life Vest-This is an unupgradable example, about as nice as we’ve ever seen. This is made of tan rubberized material, and all of the components, including the rubber hoses, the porcelain fittings, the adjustment strap, and associated belts, are all present. In fact, this is the cleanest one I have had in years. It is serial numbered and has a maker’s code, which is “aqb,” under the rear flap. You would never have to upgrade this example.