slinky

...length of the Slinky (0.34 m). Wha? A wave on a Slinky has a frequency of 1.85 Hz. It takes 3.7 s to travel the length of the Slinky (0.34 m). What is the wavelength?

It started in the 1940's and was a hit. Later it began to decrease in popularity, but a movie re-introduced the slinky. What was it?