I found this frame at a garage sale, and wanted to know if it was a GT frame if so what kind? The serial number I found on the bottom is GB06070827? Bike frame I'm wanting to build if it would be worth my time.
It's virtually certainly some kind of department store BMX. The welded-on pants-guard attachment points, the battleaxe-like dropouts (which did have their era on actual BMX bikes, but most of that time also overlapped with the ubiquity of 14mm axles), kickstand plate, and the threaded 1" steerer combine to point pretty decidedly in that direction.