Machine Cancel Identifier - Circular Postmark, Wavy Line Killer, Year Check
Your example has a wavy line killer (cancel) and a circular postmark. The year date is not alone at the bottom of the circular dial, and the distance between postmark and killer bars is 7mm or less.
Question: Is the year date split into two sets of digits?
More Links
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Bob Swanson's Machine Cancel Page
Bob Swanson's Postal History Page
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Updated Sun Feb 24 10:13:17 MST 2019