Help to identify this bicycle, please
The one piece seat-stay/chain-stay construction looks like a Hutch* from the early 80's however, having both the left &amp; right side stays made from one bent tube doesn't match up exactly with anything I have looked at while browsing the BMX Museum. It might be something from the late 70s (they only have from 1980 on pictured there). Or it might be a knock-off cheap copy of the Hutch design. That might be a good place to continue your search.

Based on the eBay prices of some of these bikes, I'd say you've likely got yourself a valuable project on your hands!

*I picked Hutch based on one that was similar looking on eBay that came up in a search for "bicycle gt 4130 cro mo team".