Vintage 1970 JAPAN SEIKO 5 SPORTS SPEED-TIMER 6138-0010 21Jewels Automatic.

Vintage 1970 JAPAN SEIKO 5 SPORTS SPEED-TIMER 6138-0010 21Jewels Automatic.

Welcome to my auction!

Item description

Movement :

• Pet name : 61 5 SPORTS SPEED-TIMER.
• Caliber number : 6138A,B.
• Movement : Automatic.
• Beat rate : 21800bph.
• Year of manufacture start : 1970's.
• Factory : Suwa.

Externals :

• Serial No. : 032006.
• Dial No. : JAPAN 6138-0010T.
• Glass : Crystal.
• Case size : About 43.8mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 190mm.

Condition :

• Used, it runs well.
• Function is good.
  Day of the week can be set in English or Kanji.
  Quick set(Day/Date) : Okay.
  Set of the days of the week : The set at one stage pulling the crown.
  Set the date: The set at one stage pulling the crown.
• The day difference time of an used watch is about +-1 minute / day.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

• The Sovereign Dawn of Dual-Register Automatic Chronograph Supremacy (1970): Manufactured in 1970—a legendary watershed moment in global horology following the dawn of the automatic chronograph—the Seiko 5 Sports Speed-Timer reference 6138-0010 (affectionately known by collectors worldwide as the ""UFO"" or ""Yachtsman"") represented Suwa Seikosha's pinnacle sports timing flagship. Offered exclusively on the domestic Japanese market (JDM) with dedicated ""Speed-Timer"" branding, it established Seiko's technical dominance in heavy-duty racing chronographs.
• The Advanced Column-Wheel & Vertical-Clutch Caliber 6138 Engine: Powering this motorsport instrument is the celebrated in-house 21-jewel Caliber 6138 (6138A), an automatic chronograph movement operating at 21,800 vibrations per hour (vph). Featuring an over-engineered 21-jewel specification, this movement integrated a traditional column-wheel coordinator with a state-of-the-art vertical clutch system—ensuring seamless chronograph engagement without hand jump—alongside a two-register readout (12-hour and 30-minute totalizers), manual hand-winding capability, and quick-set dual-calendar operation.
• Architectural ""0010"" UFO Helmet-Case Geometry: The reference 6138-0010 is globally celebrated for its imposing, futuristic circular ""saucer"" or ""helmet"" stainless steel case. Featuring hooded, hidden lugs, radial brushed front planes, and razor-sharp mirror-polished Zaratsu edge bevels, the muscular case houses dual pump pushers framing an integrated external tachymeter bezel calibrated for high-velocity speed measurements.
• Masterful ""Speed-Timer"" Racing Dial and Bilingual Utility: The dial of the 6138-0010 showcases quintessential 1970s rally aesthetics, featuring a matte black backdrop punctuated by vibrant orange-red chronograph hands and recessed sub-dials. Symmetrically framed at 3 o'clock, the dual-calendar aperture houses a bilingual (English/Kanji) day disk alongside the date wheel, proudly offset by the iconic applied ""5 Sports"" shield, ""Speed-Timer"" script, and the Suwa Seikosha vortex insignia.
• An Investment-Grade Pillar of Japanese Chronograph Heritage: Produced during the inaugural release era of the 6138 series in 1970, the 6138-0010 Speed-Timer remains an exceptionally coveted, museum-grade cornerstone reference for serious vintage chronograph collectors. Merging Seiko's legendary column-wheel vertical-clutch engineering with iconic space-age case styling, it stands as an enduring monument to Showa-era sports horology.

For more information, please look at the pictures.

Notes

• Before buying.
  The vintage watches we sell are inspected and adjusted so they work fine. However, since it is an vintage watch, Please purchase on the assumption that it will be repaired.
  
  
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