Flame suit is on!
Cort have been around since the 60s, I just don't know if they were releasing guitars with their name on the head stock.
I think we need to seperate vintage/old from a usable instrument. I have a 90s Yamaha which is probably plywood, its worth a coke and a packet of chips but it doesn't sound too bad. But it will never be desireable and get to 'vintage' status, it'll just get old. I have a late 70s Aria nylon string I bought for R80 including a case, perfect example of this.
As for people wanting to collect 70's Ibanii, you get people who collect McDonalds toys ?
Building guitars in the east (like Ibanez) came about when people were starting to do things as cheaply as possible as someone spotted a gap or a dip in the market. The hey day of instruments had passed and the market wass full of really mediocre instruments.
As early as the 1970's, musicians and collectors began to recognize the value of older instruments. The mass production of both acoustic and electric guitars in that era served to highlight the quality workmanship and materials of the older instruments. Historians, such as George Gruhn, helped to codify both the monetary value and sound quality of these guitars for both collectors and musicians.
From wikipedia, I know most people don't see it as a credible source.