Yup that is a Seawitch.  IMO Classic Sterns rock  I liked them back in the day, and now own Seawitch, Stargazer, Meteor, Cheetah, Flight 2000, Quicksilver and Nine Ball.  I like the flow and the gameplay on these machines, as well as the artwork and the sound (once they adopted their new sounboard in 1979, from Meteor on).  A lot of Stern machines seemed to come into Australia and a lot over here to Perth.  This could have been due to their tie in with Leisure and Allied who assembled many of their titles here, including Cosmic Princess which was an 'Australia only' machine!

cheers
Ian