Atari VCS History – research

I’m doing a bit of research on the Atari VCS CX-2600 and it’s variants. First I am just trying to get the manufacturing dates correct. But I am also trying to find out more information about each variant; how well they were received? how many units sold? which models were more prone to defects?

Here’s what I have so far from reading info on the web but I don’t know how accurate these dates are.

Given these facts, if they are correct, it would seem like the Atari 2600 Jr. probably sold more units. But I also believe the light sixer sold at least 3 million units during 1978 and 1979. (but I do not know if those numbers include the Sears Telegames console or not).