Jacob Custer, Norristown, PA, was a clockmaker like no other. He made a fair number of clocks, all of which were more or less "one offs." To suggest he marched to the beat of a different drummer would be a kind understatement. His work defies conventional wisdom. Custer was working at the end of clocks built by single artisans in America. Mass production using sheet brass had already sounded the death knell for wood works clocks and clocks were being built by very few makers still using hand worked cast brass parts and pieces. Custer was an exception, on more than one level. This particular clock is circa 1830 +/- a bit. It features a very unusual "helicopter" strike mechanism. It is rack and snail controlled, but unlike any other seen in American clockmaking. It uses the teeth on the strike side great wheel as rack teeth. The snail rides between the plates, as does all the motion works. Another anomaly is the time train is on the left side of the movement. While setting the time, the time side weight descends as the hand is cranked around. The clock also has a form of deadbeat escapement. Please see the following short videos showing the strike and time setting behaviors. Sort of something you need to see to believe it. Why Custer went to these lengths to build his clocks is not clear, other than he wanted to do something different. How he conceptualized and executed these does defy my wisdom, for certain.