Took to my LBS, they got it out with a big headset press type thing and a pipe on the end for extra leverage. I guess similar concept to the Sheldon brown mechanism. BB shell threads are clean thankfully, was just wedged in there for 35 years and in storage.

BB cup races are super clean (white marks are just reflection from the ceiling light). Threads are good, but the flats are rounded, more so on one side. Is it salvageable (it’s early c-record that takes 3/16” bearings so a little harder to find as just a cup).

photos below: