The Kendall Stamp Affixer is another stamp affixer I am trying to track down. It has a plunger lock, stamp register (number counter) that you can not reverse. It was made by the Kendall Manufacturing Company out of Boston Massachusetts.
The Kendall Stamp machines probably first appeared around 1917-19, although their patents date back to 1912,1913, and 1916. It looks similar to the Wizard Stamp Affixer. They also made test stamps. The Kendall Affixers measured about 7″ tall by 4″ long.