The full size inspector lamps, like this one that became the Acme, were developed from the zero tubular reflector dash lamp which became the Beacon Dash and have a frame which is over one inch wider than the standard square lift, to allow clearance for the reflector. I have one identical to yours, except it says Acme on the back and has the double crimp fount. Therefore, your lantern dates to the 1901-1903 period.
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