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Scale normally engraved on the bezel used to compute speed based on travel time, or to measure distance based on speed. The spacing of the marks are not linear, but rather logarithmic.

Tri-synchro Regulator

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Regulating system unique to Spring Drive movements, the Tri-synchro Regulator controls and releases the mechanical, electrical, and electro-magnetic energy generated by the mainspring. It replaces the escapement used in mechanical movements and is more stable and precise.