Who Knows what THIS THING is?

Who Knows what THIS THING is?

An interesting question on Fun Friday...

Who knows what the thing in the picture is?

Updates
10 mo
This is an escapement mechanism, used in classic (wind-up orweights) analog clocks and watches. The large wheel moves once a second, and is typically connected to the second hand in watches, and to other gears that count the minutes and hours in watches and clocks.
Who Knows what THIS THING is?
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