Seiko 6138-0030 “Blue Kakume” Automatic Chronograph — Fully Serviced, Fishbone Bracelet (Z039 Endlinks)
Original price was: $1,000.00.$900.00Current price is: $900.00.
Seiko 6138-0030 “Blue Kakume” Automatic Chronograph — Fully Serviced, Fishbone Bracelet (Z039 Endlinks)
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Seiko 6138-0030 “Blue Kakume” Automatic Chronograph — Fully Serviced, Fishbone Bracelet (Z039 Endlinks)
An October 1974 Seiko 6138-0030 “Blue Kakume,” fully serviced at Second Tour Timeworks with a barrel arbor jewel
upgrade installed on the bridge. The 6138 is widely regarded as one of the finest automatic chronograph movements
of its era — vertical clutch, column wheel, day-date complication, and quick-set functionality, all integrated into
Seiko’s signature cushion case with a deep blue dial, contrasting silver sub-registers, and orange chronograph
accents.
upgrade installed on the bridge. The 6138 is widely regarded as one of the finest automatic chronograph movements
of its era — vertical clutch, column wheel, day-date complication, and quick-set functionality, all integrated into
Seiko’s signature cushion case with a deep blue dial, contrasting silver sub-registers, and orange chronograph
accents.
Video overview
Highlights
- Reference: Seiko 6138-0030 “Blue Kakume”
- Date of manufacture: October 1974
- Movement: Seiko Cal. 6138B automatic chronograph — fully serviced, jewel upgrade installed
- Complications: Day-date, 30-minute and 12-hour chronograph registers
- Crystal: New aftermarket crystal installed
- Gaskets: New pusher, crown, and caseback gaskets installed
- Accuracy: Verified averages at +1.8 s/d, 215° amplitude, 0.24 ms beat error, 15 s/d delta across 5 positions
Condition & Authenticity Notes
- Original blue dial with silver sub-registers
- Original hands retained, **except the orange central chronograph seconds hand is an aftermarket replacement
- Original blue tachymeter bezel insert retained.
- Case retains its factory geometry, view pictures for detail
- All chronograph functions — start, stop, reset, 30-minute and 12-hour counters — operate as designed.
- Day-date complication operates correctly, with quick-set functionality intact.
Restoration Summary (From the Bench)
This 6138-0030 received a complete service of the Cal. 6138B movement with emphasis on long-term reliability.
The movement was fully disassembled, cleaned, and reassembled using Moebius lubricants throughout,
with epilame treatment applied to the pallet jewels for stable, consistent oil retention. An additional jewel was
installed at the barrel arbor port on the bridge — a known wear point on the 6138 — to improve longevity and reduce
friction. New gaskets were fitted at the pushers, crown, and caseback, and a fresh aftermarket crystal was installed.
The movement was fully disassembled, cleaned, and reassembled using Moebius lubricants throughout,
with epilame treatment applied to the pallet jewels for stable, consistent oil retention. An additional jewel was
installed at the barrel arbor port on the bridge — a known wear point on the 6138 — to improve longevity and reduce
friction. New gaskets were fitted at the pushers, crown, and caseback, and a fresh aftermarket crystal was installed.
Timegrapher Results (your wear may vary)
- Rate: +1.8 seconds/day
- Amplitude: 215°
- Beat Error: 0.24 ms
- Delta (5 positions): 15 seconds/day
Note: With this vintage chronograph, i do not recommend submerging in water.
What’s Included
- Serviced Seiko 6138-0030 “Blue Kakume” automatic chronograph
- Stainless steel fishbone bracelet with Z039 endlinks (as pictured)
- Service documentation card from Second Tour Timeworks
- Some replaced parts (Barrel bushing, date disk, unoriginal crystal)
