Source for Atlas Model History?

I bought an Atlas GP9 (MILW #253) from eBay and it came without box. So now I am searching for the Atlas product number and the year the model was produced. A search in my back issues of Model Railroader was not yet successful, still some issues to look through.
Does a Atlas model history exist anywhere in the Internet?
Any help is appreciated

 

Atlas First generation is here.

Spookshow for all engines is here.

 

It wouldn't be an Atlas First Generation loco though.

 

You're correct. I didn't see the model number on Spookshow, either, so...

[edit] How about this one? Torpedo tube? Number is 50864

[edit #2] Here, from a Walthers search to include out-of-stock items:
150-48321 Limited-Run Diesel - GP9 Phase 2 - Milwaukee Road #253.

So, Atlas number is 48321.

Walthers picture.

 

Didn't know the question was posted, as the browser froze and returned a database error. Thank you for the answers. I had checked spookshow with the same (negative) result.
I just now checked the pages at Amherst Depot and found the engine, it is from 1996.
Amherst Depot has most of these models listed. I think I had their name from an earlier post.

 

Good Evening. Atlas model #48321, w/o dynamic brakes, road number 253, made in 9/96 list price was 82.95. Made in China

Hope this is what you sought

Jerry

 

Thank you for your help, this is exactly what I sought.