Hi MercuryMan,
Instructions for posting pictures are under Forum Help and Guidelines.
I was just digging through a tub of guitar literature and found a pocket folder with a Nagoya label on it.
The folder contains several acoustic guitar brochures but they are branded Mikado and Chaser. From the looks of it, Bassassin is right. Nagoya probably exported guitars under their own name as well as other brand names. Nothing in the folder is dated but just by looks I would say 1980's.
I have tubs of acoustic guitar literature that I haven't uploaded to the site. I'll post to this thread if I find anything more definitive.
For now, here's the label, it might help with your research: