The G and E are WWII designations...they are stamped as single marks and not part of part number, on handles or in selector pocket. G as industrial designation is part of the part number.
The V used as military designation is part of the part number, like MV-*** would be military version of some 1/4" piece that would be M-*** on the tool truck. The V goes back at least into the 1960's, do not have any information or hardware to tell me more.