When I was a kid they had these ads in comic books. There was a creek across the street from our house at the time, and I wanted to get one thinking I could take it in there. Glad I didn’t because years later someone who ordered one told me they were made of cardboard. The “torpedos” were fired by a rubber band.
Well, I found this picture of what one looked like. Better than I expected, but I would have not fit in something this small. It was made for little kids. I was around 12 when those ads came out.
What did you expect for $6.98 plus 75 cents shipping. Those were the days.