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The Tanaka Line
Steel · SD dial · Early 1960s
Steel · SD dial · Early 1960s

Why it matters

The starting proposition of this story: a flat dial, straight hands and disciplined planes, while the case and its projecting lugs still read as distinct forms.

What I look at

The flatness is coordinated across the dial, hands, crystal and polished lug surfaces. The folded indices retain a more ornamental character.

The relieved underside and the chamfers at the caseback make the upright flank feel lighter than a simple cylindrical wall would.

The gold-filled reference changes from J14102E to J14102 in October 1962, alongside the reduction from 100 to 80 microns of gold. The steel version retains J14102E through August 1963.

The watch

ReferenceJ14102E
FamilyKing Seiko First
Family introductionAugust 1961
Steel versionJune 1962
WindingManual
Seconds settingWithout seconds hacking
Steel case width≈ 34.5 mm, excluding crown
Dial variants shownSteel SD / early dial (small “25”)

Approximate measurements of my own watch.

Related watches

In the origin story

The consequences of flatness
Watch details