He GeetarGal, Tough one but I've tracked it down, Knox was one of the the trade names of the Kay Musical instrument Company which shut up shop in the late Sixties, the Kay company was split up and the Knox brand name along with Kent were sold as part of a package to the Japanese who carried on using the names after 1968, if your guitar is pre 68/69 it's made by Kay in the US, if it's post 68/69 it's a Japanese guitar made for the low budget market. Are there any other marks on it like a serial number?
Here's a Wikipedia about Kay.
Kay Musical Instrument Company - Wikipedia, the free encyclopedia
The Kay guitar company grew out of the previous company and carried on but those brand names Kent and Knox became Japanese brands.
This link's useful if you like a bit of history.
http://www.kaybass.com/history.htm
Hope this helps
Best Wishes
Chris
You don't stop laughing when you grow old; you grow old when you stop laughing.