The American company manufactured and marketed several machines, based on several patents, during the late 19th century. Most of their machines were used in Boston. William Barlow's Award-Winning Boston Machine Cancel Exhibit is a great starting-place for learning about the evolution of these machines.
Ah, but you say, I came here because my cancellation is pre-1900, not because it is necessarily an American machine example. If your cancel does not fit the following description, (for now) your only course of action is to try to check the web page with the combinations of postmarks and killers for machine cancels of this time period.
An American machine from before 1900 will have the characteristics:
The American company created other non-flag markings, some of which are shown below:
The 6 bar killer is positioned above center, bars arranged convex on left, nearest to the circular dial postmark.
The dial is rimless, often used on 3rd class mail, killer has 5 bars, convex on left.
The 5 killer bars are convex shaped on left.
The 5 killer bars are convex on left, and have a vertical bar crossing them near the postmark.
This is a different machine from those shown on this page, the primary identification point being the 'gripper' marks to the left of the circular postmark, and the use of a 7-bar killer.
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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