Family: 613xBased on Seiko 6139B
Caliber 6138 is an automatic chronograph movement introduced by Seiko in 1969. An in-house development, it shares its architecture with the 6139B, recognized as Japan's first automatic chronograph. The movement powered Seiko's Speedtimer line of racing-style chronographs. It has been discontinued.
Last updated 8 Jul 2026Suggest a correction
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Display Type
Analog
COMPLICATIONS
Chronograph
QUICK FACTS
BRAND
TYPE
AutomaticSTATUS
DiscontinuedMANUFACTURE
In-houseLAUNCH YEAR
1969BASED ON
Seiko 6139BCALIBER FAMILY
613xALSO KNOWN AS
cal. 6138seiko 6138
FOR WATCH DEALERS
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