Plaintext question for today.

1. Created in 1968. Brought life back into a dying brand.
2. They are made from 6 individual parts of ABS.
3. Started with a cop, a fireman, a nurse, and astronauts.
4. The most expensive one ever was made of gold, and was a model of C3P0
5. Globally, 3.9 are sold per second

What am I talking about?

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Edit: It should be 1978, and not 1968. My bad. Points given to anyone who mentioned Lego.