In the early 1950s , All-Nation acquired General Models, Atwater models and scale model railways to add to their manufacturing Line. General had an EMD switcher at the time and I think Atwater may have made an F style diesel. I think All Nation offered some small steam engine kits, a ten wheeler and an Atlantic which i thought traced their heritage to prewar Varney Offerings. Not sure how long they offered the locomotive kits
In your case, perhaps Atwater models was using some All nation parts prior to the buyout or perhaps what you have may have been Atwater inventory that All Nation was using up around the time of the acquisition. If you look at the paper work for addresses, dates ,etc it might relate the document to a time period giving you a bit more insight as to when the kit was packaged.
