CANTON, Miss. (CBS) — A classic childhood toy turned 70 years old over the weekend.

The idea for the slinky came from naval engineer Richard James after he knocked a spring off his workbench in 1943. Two years later, the first slinky was sold at a Philadelphia department store for $1.

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Every slinky is made from about 67 feet of steel wire.

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More than 300 million have been sold in the first 60 years of production. The United States Postal Service issued a Slinky stamp in 1999.

Slinky’s maker also says the song in its famous commercials became the longest-running jingle in advertising history.

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