Seiko Cal. 6640 - 551

This Quartz model from 1967 features a 45mm Hardlex-Coated Steel case. It features a Blue Sunburst dial protected by a Mineral crystal and offers 130m of water resistance. [seikata-wm-54f4524f08de]

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

10.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1967

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