Your machine cancel was made by a machine sold by the American Postal Machine Company. The most common, and most popular collected machine is the American 'flag' cancellation. This type, however, with a 6-bar straight-line killer, is far less common. Note: the American company made machines that impressed various types of straight-line cancels in the late 1800's. These are not normally included in my 'finder', since they fall before the Postcard Era. These later straight-line cancellations appear from about 1909 to around 1920.
There is a bit more information available about these machines on my Machine Web page.
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Bob Swanson's Machine Cancel Page
Bob Swanson's Postal History Page
Updated Sun Feb 24 10:13:17 MST 2019