I have had this box for some years. It is the only 30 M1 box I have seen that has the “For Machine Gun Use” on the lable. The layout for the “20 CARTRIDGES BALL” is also strange. All of the other Ball boxes I have see are labled:
The box is sealed so I have no idea what the headstamp is. Can anyone give me a ball park date from the Lot# and any information about the “For Machine Gun Use” marking would be very much appreciated.