Here's some trivera. I can still remember some of the other machines they had at the local arcade. Klondike this also was a great game (you should know Mitch). Gottlieb Flying Carpet which I picked up a few years back (Still in the restore que). They had a stand up submarine game that you looked through a periscope and had a sonar sound effect that always ran. Any one remember this game? early 70's.
At the local servo out the back had a few pins. Gottlieb Sweet Hearts, Williams Straight Flush, Williams Super Star and one I cant remember that had 2" zipper flippers.
Sea Wolf or Sea Wolf II could be the game you are thinking of ?
Zipper Flipper machine that was quite common in Australia might have been the Bally "Nip-It" ? That is a simply awesome EM. I'd love this title !