The Global guitars were acoustic and electric guitars that were cheaply made instruments that came from a variety of Asian sources that got imported to a USA importer located in Chicago, IL and the importer gave the guitars the Global name and chained them out to catalog companies like Mongomery Wards, Sears and ect. and chained out the guitars as low end budget priced instruments to discount retail outlets and music shops during the 60's, the 70's and some found from the early 80's. The imports were 6 string and 12 string acoustic guitars and 6 string electric guitar copies of name brands not quality. It's rare to find one in excellent condition that's worth $50.
They may have good tone/sound/projection or they may not for such is subjective to every individual by knowledge and ear, feel and personal prefferrences !!!
The Global brand model and serial numbers are so obscure and records kept of either by manufacturers are just nearly next to none existent