That's and awesome looking router package you have there Steven.
Just guessing from the way different things look in the photos you posted, mid 50's to mid 60's is the era when that was the latest and greatest.
My early 1962 Millers Falls router is very similar to yours in how the entire motor housing has threads around it to work as a bit depth adjuster.
When looking for information on mine, I encountered a lot of magazine adds from when it was popular. I was also lucky enough to find some product reviews that provided far more info than adds alone. I still haven't found an owners manual, but who knows, maybe someday.
Access to the library of congress's newspaper archive is free and there may be adds or articles covering your machine in historical print. There might even be some place out there that has a collection of historical mail order catalogs.
wbh1963 is flowing with the grain in Arlington, Washington, USA
A day without curls is like a day without sunshine!