Limited Edition of 35 Pieces. Chronoswiss Watch Flying Regulator Open Gear Limited Edition CH-8753-BLBK. The anniversary watches unusual design is a play on the Regulator theme, placing it front and center with the Open Gear design. The dial is simultaneously its module board, onto which the train wheel bridges of the skeletonised gears are mounted. The Flying Regulator Open Gear also reveals surprising insights at 6 o clock.