Seiko Cal. 6240 - 428

The Seiko 6240-428 represents an important milestone in Seiko's 1983 lineup. The Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-7013abc0af3c]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Burgundy

Jewels

33j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1983

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