Seiko Cal. 3818 - 639

Released in 1977, the Cal. 3818 with design code 639 was part of Seiko's domestic market collection. Powered by the 3818 caliber with 34j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-0e83cdd41ff0]

Also known as: Tuna, Arnie

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

12.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1977

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