Seiko Cal. 5640 - 241

The Seiko 5640-241 represents an important milestone in Seiko's 1968 lineup. Powered by the 5640 caliber with 23j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-c7dab3fb4a10]

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

White

Jewels

23j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1968

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