Seiko Cal. 6640 - 315

The Seiko 6640-315 represents an important milestone in Seiko's 1968 lineup. It features a Silver dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-00fafa01013b]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Silver

Jewels

23j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1968

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