Seiko Cal. 6613 - 640

The Seiko 6613-640 represents an important milestone in Seiko's 1975 lineup. Powered by the 6613 caliber with 17j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-a0be1a7cb182]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

17j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1975

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