Periscope © 1968 Sega.
To play this game, you view through the periscope with cross hair line. In it you will see warships moving from right to left. There are 4 ships which are actually plastics models moving on conveyor in internal console using mirror reflection. When you the button to fire the torpedoes you will see light path of torpedo direction. You can fired 2 torpedoes on 1 ship of 2 ships. If you hit you get bonus if you miss you have less torpedoes out of the 20 in your sub.
Click to enlarge