U.S. Machine Cancel Identifier – Doremus Type ‘A’
Your machine cancel was made by a machine sold by the Doremus Company. The more common form of this machine’s impression has vertical bars for the killer, rather than than the horizontal bars of this type. This example is from the first type manufactured by the Doremus Company, and can easily be mistaken for the impression of other brands of machines in use around the turn of the 20th century.
Doremus Type ‘A’ with Horizontal Bar Killer (Note the use of ‘P’ for PM in Dial)
There is a bit more information available about these machines on my Machine Web page.
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