Used vintage Schwinn 26x1-1/4/1-3/8" S6 ISO 597 36 hole rim, stamped "Schwinn Tubular S-6".  (This will NOT fit modern Asian 26x1-3/8 ISO 590 tires). Endrick flat style rim.  Has rust, needs a good polish -- see photos.  For your vintage wheel repair or rebuild -- Schwinn Collegiates, Speedsters, Suburbans, Breezes, etc.