NOS/New/NIP Shimano 105 1" Threaded Headset, made in Japan.  Model HP-5500.  For 1" threaded steerer tubes.  Cartridge bearings, 26.4 crown race diameter, standard English threading.  Understated and the highest level of quality from Shimano.  It would be great on the nicest of frames.  New in original factory OEM packaging.  Buyer to pay $6.00 USPS Ground Advantage shipping with tracking.  Buyers outside the Continental US to use Ebay's Omternational Shipping.  Thanks for looking.