made a new discovery after wire brushing the frame! Looks like 2 separate numbers are stamped near the rear wheel area. “590” and “29645”

also on the headset, i discovered a new letter and it looks to read “GOREVESS” or something similar. Maybe it was etched in manually though?

ibb.co/jgjXwkr

ibb.co/ZMRKBPY

ibb.co/8xY4DWk