I try to contact you by youtube, but you didn't answer. I try this way.
Its a while ago, but i found the only existing Video of Sega's Periscope on the net!
If you have more informations to share, plese do. Informations about the Sega periscope are extreme RARE.
The Video: You need to scroll down this page to A"musement Exhibition (1969)"
A lot of cool vintage Games are shown there. In the middle of the movie, the Sega Periscope will appear. The game is played by a a pretty Girl. *SMILE*