This is a very uncommon correct box for Hamilton Electrics made during a very short period of time during mid-1957. Early 1957 boxes were the long gray variety, and in late-1957, the box was changed to the more common clamshell style. It is in great condition, and would look great with your watch.
Guranteed to arrive in fine working order, or money back on return, or return within 7 days for any reason for a full refund. I am an NAWCC (National Association of Watch and Clock Collectors) member, and stand behind what I sell.