Seiko Super Chronometer, manual winding, case No.1721 – seldom-seen 1950s vintage with two-tone silver dial, gilt Arabic numerals and hands, centre seconds, stainless steel case, on a replacement black leather strap. PLEASE NOTE: the dial shows clear age-related patina: mottled and speckled oxidation across the outer ring, fine scratches across the raised centre disc, a dark grey corrosion patch and ring around the centre hand post, and small dark and reddish spots near 12, 2 and 5 o'clock. The domed acrylic crystal has light surface scratches. The case has light scratches and some dark residue inside the lug tips. The strap and buckle carry no Seiko markings and are not original. The caseback carries no serial number, so the exact production year cannot be confirmed; the model dates from the 1950s. Please check the photos carefully before bidding. Overview A 1950s Seiko Super with chronometer-marked dial, a hand-wound dress watch from the early years of Seiko's post-war wristwatch production. The Seiko Super, introduced in 1950, was Seiko's first centre-seconds wristwatch and the predecessor of the Seiko Marvel; it was made only for a few years before being replaced, and examples with the CHRONOMETER designation on the dial are seldom seen today, making this an uncommon piece for collectors of early post-war Japanese watches. The two-tone silver dial has a polished raised centre medallion and a matte outer ring with a printed railroad minute track and numerals every five minutes, applied gilt Arabic numerals at 12, 2, 4, 6, 8 and 10 o'clock with gilt dart markers at the other hours, and is signed CHRONOMETER / SEIKO at 12 o'clock and SUPER / ANTIMAGNETIC / WATER PROTECTED at 6 o'clock. Gilt dauphine-style hour and minute hands and a slim centre seconds hand with a red tip. Round polished stainless steel case with a stepped two-ring bezel, faceted angular lugs, a large fluted onion-style crown at 3 o'clock and a snap-on caseback. Fitted with a black crocodile-grain leather strap, 16 mm, with a plain polished steel pin buckle. Specifications - Brand: Seiko - Model: Seiko Super (chronometer dial) – dial signed CHRONOMETER / SEIKO / SUPER / ANTIMAGNETIC / WATER PROTECTED - Reference: case No.1721 (stamped on the caseback) - Movement: Seiko manual winding, centre seconds (calibre not visible, movement not photographed) - Case: stainless steel, polished, snap-on caseback marked NO.1721 / WATERPROTECTED / ANTIMAGNETIC / STAINLESS STEEL, unsigned crown at 3 o'clock - Case diameter: approx. 30 mm (left to right, excluding the crown) - Lug width: 16 mm - Dial: two-tone silver with patina, applied gilt numerals and markers, no luminous material - Crystal: domed acrylic, light surface scratches, no chips or cracks - Strap: replacement black crocodile-grain leather strap, 16 mm, 7 holes, unsigned polished steel pin buckle - Strap size: fits a wrist of approx. 18 cm on the hole used as pictured - Total weight: approx. 35.2 g - Year of production: 1950s (no serial number on the caseback; exact year not confirmed) Condition Used vintage watch in good condition for its age, with visible signs of wear. Crystal: fairly clear with light surface scratches, no chips or cracks. Dial: mottled patina on the outer ring, fine scratches on the centre disc, dark corrosion patch and ring around the centre hand post, scattered small dark and reddish spots; printing and applied numerals intact. Hands: gilt hands intact, light age. Case: light scratches and polishing marks, dark residue inside the lug tips; no dents. Caseback: light swirl scratches, stamping legible. Strap: near-new. Please refer to the photos for the exact condition. Working order The watch is running as pictured. Timekeeping accuracy and water resistance have not been tested with professional equipment. Please consider this a vintage watch over sixty years old that may require servicing at some point. Included Watch and strap only. No box, papers or accessories. Shipping Ships from Japan. Registered and insured shipping, mainly via DHL or FedEx. Import duties or taxes may apply depending on the buyer's country. These charges must be paid by the buyer. No weekend shipping as courier pickups are unavailable on Saturdays and Sundays. Please feel free to contact me with any questions before placing your bid.