Seiko Cal. 3845 - 640

The Seiko 3845-640 represents an important milestone in Seiko's 1978 lineup. Powered by the 3845 caliber with 24j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-b90d553598a2]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

39mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

100m

Dial Color

Champagne

Jewels

24j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1978

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