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Seiko JDM Speedtimer Bracelet (6139-600x, 6139-603x)

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At the end of the 1960's, Seiko released a swanky new Chronograph called the Speedtimer. These came in several colors with minor variations added along the way. One of the earlier and more rare examples had a unique bracelet that came only on JDM models (Japan domestic market) of which all had "Sports 5" plus "Speedtimer" on the dials. They were used on 6139-6000, 6139-6030, 6139-6031, and 6139-6032 models.

What I am offering here is my own take on the classic (and rare) Speedtimer bracelet. While I always thought the look was unique, I was never a fan of the end-links. So, I came out with my own. I present to you an homage to the classic JDM bracelet with an Uncle Seiko twist. 

What's included:

One bracelet, one pair of end-links, one pair of 1.8 mm spring bars


  • Lug width to buckle:  19mm (widest 22mm) to 16mm 
  • Length:  180mm
  • Min length after adjusted:  120mm
  • Buckle style:  Pressure clasp
  • Thickness:  3.2mm
  • Net Weight:  50 grams
  • Finish:  Brushed metal
  • Spring bar diameter:  1.8mm 
  • Lug end style:  Standard hollow curved end
  • Adjustment type:  6 removable links-- pin type adjustment
  • Material: 316L Stainless Steel, all solid links, standard (hollow) end links
  • Designed to fit: 6139-600x and 6139-603x