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Seiko

Seiko Sports 100 7A48-7000 from 1984, with an analog chronograph dial, pointer date and moon-phase display

Seiko Caliber 7A48: Quartz Chronograph Movement Guide

Seiko Sports 100 7A48-7000 from 1984, with an analog chronograph dial, pointer date and moon-phase display
1980s-vintage-watches

Seiko Caliber 7A48: Quartz Chronograph Movement Guide

Factory specifications and practical moon-phase/date setting for Seiko’s 15-jewel 7A48 quartz chronograph, illustrated with three original VWS watches.

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1986 Seiko Sports 150 7A38-713A with charcoal chronograph dial, gold-tone markers and day-date display
1980s

Seiko Caliber 7A38: Quartz Chronograph Movement Guide

Explore Seiko 7A38 chronograph specs, functions and day-date controls, with original VWS 1984–1986 watch examples.

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2009 Seiko 7T92-0HX0 chronograph with black dial, steel case and bracelet
Chronograph Watches

Seiko Caliber 7T92: Quartz Chronograph Movement Guide

On a Seiko 7T92, the hand that appears to stop after about ten minutes is not necessarily reporting a fault. It may be performing exactly as Seiko designed it to: the 1/20-second counter rests whil...

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Original VWS 1977 Seiko 6139-6002 yellow-orange dial, blue-red tachymeter bezel and steel bracelet
1970s Seiko

Seiko 6139 Pogue: Models and Variations

A reference-focused guide to Seiko Pogue 6139-6002 models, yellow and black dials, Skylab history, movement design and collector identification.

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Seiko Panda 6138-8020 twin-register chronograph, VWS original photograph
1970s-vintage-watches

Seiko 6139 vs 6138: Vintage Automatic Chronographs Compared

Compare Seiko 6139 and 6138 automatic chronographs, their timing registers, winding systems and buying checks using original VWS archive watches.

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Close-up of Seiko 6138-8020 Panda dial, 1977
1970s-vintage-watches

Vintage Seiko Chronograph History: From 6139 to 7A38 & 7A48

Trace Seiko chronograph innovation from early mechanical stopwatch watches to the multi-register analog quartz era, with real archival examples.

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Close view of the silver dial on a 1985 Seiko Sports 150 7A38-7130 quartz chronograph
1980s-vintage-watches

Seiko Sports 150: Models, Features & History

Explore the 1980s Seiko Sports 150 chronographs, comparing real 7A38-7130 and 7A38-713A watches, case details, quartz functions and collecting checks.

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