 
There were some traces of glue residue from a small rectangular sticker on the back of the headstock under this Quality Control sticker.
 
I fitted some new tuners because one of the originals had been replaced and one of the others was broken. I guess the block logo predates the script logo which was first used in 1978 according to US Trademark Office. I feel it was made in Korea but I'm not sure. Switch and pots are Japanese and the tailpiece is stamped Japan underneath.
 
Here's the model number on the neck plate.




 According to their records, first use was
  According to their records, first use was 