Assuming this is the A7750 movement, and not the 21J fixed second hand model?
The large second hand you are referring to is the chronograph hand, and parked at 12oclock, the same as the sub-dials @9 & @3 indicate the chronograph has been stopped, and reset. Your seconds hand is the hand of the sub-dial @6, this is where your second hand is.
To start the chronograph you need to unscrew the crown @ 2, and push it. Press the same pusher to stop the chronograph. Then to reset the chronograph you unscrew the crown @4 and push that pusher, and all the hands will reset to 12oclock apart from your send hand in the sub-dial @6.
Got a link to the watch from Andrews site so we are on the same page here?