The operation of an early Autavia (Valjoux 59) is entirely different from that of the later Autavia (Valjoux 340). Functions of an early Autavia (Valjoux 59) are as follows:

• start the timer by pressing the crown (center)

• press the pusher (on left) to stop the timer ("time out"); press again to continue running ("time in"); may use time out / time out function repeatedly

• push down the crown to stop timing (at end of event); timer cannot be restarted once crown has been pressed

• press crown again to reset all hands; timer can only be reset at end of event (not from "time out" position)

Functions of the later Autavia (Valjoux 340) are as follows:

• start timer by pressing crown (center)

• push crown again to stop the timer ("time out"); push crown again to continue running ("time in"); may use time out / time in function repeatedly

• push down the crown to stop timing (at end of event); timer may be restarted by pressing crown

• press pusher (on right) to reset all hands; timer can only be reset when stopped ("time out")