493 Space Command Center is a Classic Spaceset released in 1978. It contains a surface station, two rovers, and four Classic Spaceastronauts (two white, two red).
The station is built upon a grey crater baseplate. The building contains a control room with two swivel chairs (which were entirely brickbuilt and no dedicated chair pieces), as well as several computer monitors. On one of the walls is a large computer screen that showed a LEGOastronaut in space (This was a large preprinted piece, and not a sticker).
This was the first set that contained a crater baseplate, introduced in grey.
This set was only available in the US, where it was sold instead of the identical set 926 Command Centre that was available elsewhere.