Quoted from Murphdom:
How many variations of these arcade style pins were made? I only know of one other which is Spooksville
Bally made Hi-Fi which also has a shaker but it isn’t a stand up.
Spooksville is the only other one I know of in this form factor. This Sea Hunt has been cleverly modified to work as a Free Ball machine. Specials disable the ball count in some way when you drain, so you get the same ball number to play again. Interesting but once I figure out what was done I’ll likely put it back to stock if I can do so easily.