Seiko Cal. 5640 - 538

The 5640-538 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5640 caliber with 25j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-82c031df4bc0]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

12.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1977

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