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The Chalmers Motor Co. was an automobile manufactuer located in Detroit. The #3 pin is always located higher than pins #1 & #2 . It may have been done for flair to better represent the letter C. Chalmers Motor Company was eventually absorbed by Chrysler.
This control pattern has been found on 3 stamps with Mailometer type V perforations, The type V was only known to show up in a brief 2 week window in May/June 1911. This being the only usage on a machine equipped with a control mark die.
Thought is the Detroit office was using up some experimental sheet stock. These were most likely mixed in with the normal Schermack type III sheets prior to being made into coils. Very rare.
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