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A. Lange & Söhne

Yes: you are both correct.

 

It works by linking a stopping bar to a small snail cam. As the power reserve runs down, the snail cam is engaged and gradually draws in a stopping bar to interrupt the second hand at exactly the 0-seconds position at the end of its current revolution. Then, when you begin to wind the watch, the snail cam rapidly makes one full turn and the bar gets further and further away from the seconds wheel, soon releasing the hand to start turning again - then the cam stops at its "fattest" position holding the stopping bar away from the seconds hand and allowing it to continue to turn freely. This mechanism is entirely different to the Sax-0-mat's (and 1815 Tourbillon's) "zero reset" function which works upon pulling the crown out and uses a hammer and heart-shaped cam, just like a chronograph.

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