Clock Six Win (1930)
Rotating the key would wind up the mechanism and release the clock hands. The clock would pay out according to the position that the hands came to rest. This was Bryan's second machine and it was a runaway success.

The top two illustrations show the cheat mode incorporated into the mechanism..  The left hand picture shows the wheel used to select the amount paid out.  The deepest slot is the twelve o’clock payout and the jackpot payout trip.  As you can see from the right hand picture, it can be adjusted by turning the small screw just above the right hand side of the arm.  The gap can be  adjusted to any size making it more difficult to win.  The illustration shows the arm in the fully closed position making it impossible to win.  If the clock stops at the twelve o‘clock  position the hands will jump slightly to the right.