Several of us, some several times, have asked Clausing about production history of Atlas Press products and AFAIK always gotten the answer that all of their records were lost in one of the many moves that Clausing made in the second half of the 20th Century. Whether they were actually lost or actually deliberately destroyed doesn't really matter today. They don't exist.
As far as models made and years that they were made, you would have to go through all of the Atlas catalogs and manually compile a list. Unfortunately, no one ever scanned all of the Atlas catalogs like they did the Sears Power Tools catalogs. One serious problem with the Atlas catalogs (most of which I have) is that, unlike the Sears ones, very few are dated.
Are you only interested in the reciprocating saws, or both those and the continuous (band saw) ones?