I don't know about your scope, but I'm quite sure some of these were 1950's-era, as mine is stamped 1957. Here's a picture of the interior of the case with the original manual:
Note the printing on the interior of the lid, a close-up of which is attached below:
As you can see, it is clearly marked "1957". Also of note are the primitive green canvas lid restraints and the brown felt packing bags that are hand tied and used to pad the various components of the scope to keep them from banging around and getting scratched. Overall, it is a great scope, and the images are impressive for a 60 mm.
What a great find on Goodwill. I hope you enjoy yours as much as I do mine. Thanks for sharing your find, and the pictures.