These are Handle -less Hand Warmer US Navy Watch MUG which are the type made for the US NAVY in the WW II era. They are referred to as WWII LIBERTY MUGS. Designed without handles so they could be packed and stored more easily aboard ships and submarines, and they warmed the hands while on Watch.
These cups have the same bad-assed six Navy Dive Pins/Devices which are applied under extreme heat of the manufacturing process, they will not fade. Please indicate which cup/s and how many by using the dropdown menu and shopping basket.