The manufacturer�s original playfield drawing (not shown here) is dated 8/1/58 and has the signed initials HJM. The manufacturer�s Tool Room copy of this drawing (also not shown here) is dated 8/7/58, marked completed on 8/13/58. The flyer for this 1959 'Sea Wolf' claimed the disappearing bumper was "The most fascinating new idea for a pin game in 25 years!" even though Williams produced Gusher with the very same feature in 1958. This claim for Sea Wolf may have resulted from the intent to first use the disappearing bumper on a 2-player Williams' 1957 'Sea Wolf', a game that was never produced. Reportedly, the schematic for this game inexplicably does not show the five "Ball in Play" lights or circuitry. We have no schematic in this listing to confirm this.