U.S. Machine Cancel Identifier – Columbia
Your machine cancel was made by a machine sold by the Columbia Postal Supply Company of Silver Creek, New York. The machines made by this company generate a wide variety of markings. This earlier marking can be confused with those made by other manufacturers: just one of the reasons why this ‘machine finder’ system was devised. Note that these 6-bar Columbia machine impressions are quite uncommon
Columbia Machine Impression (Easily Confused with Other Manufacturers)
There is a bit more information available about these machines on my Machine Web page.
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