Unfortunately, beginning in the late 1960's, Atlas-Clausing, Clausing-Atlas, Clausing and finally at least the last time that I called them, Clausing Industrial, began moving every few years. In one of the moves, or maybe in every move, some of the history was lost. Today, they have nothing. So as pontiac428 said, all that can be done is to refer to a file that I have called for many years AtlasDB.dbf, This is a compilation of all of the reported machine model and serial numbers along with (if reported) either the Timken bearing inspection dates (which only go from 1939 up until early 1953) or an original invoice, owners family history, or my guess. You will find the file in Downloads (which requires Donor status to access), or in Files at
Atlas-Craftsman@groups.io.
Unfortunately, unlike some of the higher priced brands, none of the books of serial numbers and dates include Atlas (or for that matter Clausing).
If you would like to add to the list another machine, send the info to me. Include serial number, model number, where the serial number is placed on the machine, Timken bearing inspection dates (if for any reason you pulled the spindle), what it cost, when and where you got it, what it came with, condition when you got it and current condition, anything else that you want to add about it...
The file itself is a dBase 4 .DBF file with an .MDX file accompanying it. But the .DBF file itself can be opened by eXcel (at least up until 2007) and its bazillion clones and Access I think.
On the bearing date, you will only find it on Timken bearings on Atlas 10" and Craftsman 3/8" bed 12" made between about 1939 and 1952. Timken never dated bearings in the 6" lathes, milling machines or shapers. And there are no dates on any of the babbit or sleeve bearing lathes.
Also, Atlas, with the exception of the QCGB 10" lathes made between late 1947 and about late 1950, appears to have used one pool of serial numbers from the first 10" to the last. Unfortunately, Sears did not except on the two QCGB models made between about 1950 and 1957. Before that, they started the serial numbers over every time they came out with a new model number.