Seiko Cal. 0731 - 277

The Seiko 0731-277 represents an important milestone in Seiko's 1965 lineup. Powered by the 0731 caliber with 35j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-7f977a58873b]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

White

Jewels

35j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1965

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