Seiko Cal. 6643 - 325

The Seiko 6643-325 represents an important milestone in Seiko's 1977 lineup. It features a Silver dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-da3f9e3824f2]

Also known as: Helmet, Bellmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Silver

Jewels

29j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1977

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