I maintain (as more a private bit of knowledge than anything else) that my stories take place in the early-mid... sometimes late 50's. However, I am well aware of times that certain things in the background might violate that SLIGHTLY -- and so far it has been in the form of satellites in two different stories; the ones in "The Duck Who Fell to Earth" and a Brutopian "Sputnik" in "The Curse of Nostrildamus". I always draw them as 1957 style Rooski Sputniks (and in fact called that one same), so I think a satellite here and there doesn't violate my time frame. However, OTHER things do, such as there being LOTS of satellites in orbit in "Duck...Fell...", a weather satellite with a camera being used by a TV weatherman in that same story (the gag wasn't worth it, so I shoulda lost that'n), and some reference to a giant hamburger chain a la McDonald's in the second tale I ever did (which I can't recall the title of!).