Don’t know on this one, 28” steel rims, clincher tires, vertical dropouts with eccentric BB for chain adjustment. Odd fitting on rearward side on head tube , nothing matching on front side is seat mast. Large locknuts on hubs for bearing adjustment, rear axle left side mounting step, 24” frame. Fairly spectacular bars and stem. Had it so long forgot where it came from, maybe Schwinn Collection but no confirmation on that.