Your cancel is an International brand machine cancel. The dial is distinctive with the curved bar above the year. The 7 wavy line killer is quintessential later International. Chasa explained the letters perfectly. The 4, however, is to indicate machine 4, not post office #
I am the Machine Cancel Database Manager. You can send me any machine cancel scans and I can look them up in our database (including the whole world) and Slogans. I have just completed slogan lists for each U.S. State from 1899 to 2012.
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