Seiko Cal. 6640 - 693

The Seiko 6640-693 represents an important milestone in Seiko's 1998 lineup. It features a Silver dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-5230f32bfa19]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

12.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

24j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1998

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