Thank you everyone for your thoughts! Please standby for updates, I have to take measurements on the fork and headset.

To add more context: I must have got water or sweat or something down the headset at some point, because the Cinelli 1A stem got seized in the steering tube. After no lack of effort and creativity, I just said screw it and cut the stem (about 3/4" above the top lip of steering tube, wish i had gone higher). Removed fork, headset is undamaged as far as i can tell/. I've set that aside.

After i take fork and headset measurements and provide those here so you good people can help me find correct replacement fork, I'm going to get to work on removing stem from the original fork. I have some ideas after some light internet research, of course very open to suggestions if anyone has a tried and true method.

Talk soon