Spotted this neat old Sylvania on Facebook, not a whole lot of pictures but enough for me to be able to identify "GTE" and "GTMatic" branding...any idea what era this set is from, and any inkling of whether it would be worth my time?
https://i.imgur.com/TEg1HHC.jpg
https://i.imgur.com/g0J820i.jpg
https://i.imgur.com/lnVM1Sz.jpg