Seiko Cal. 3870 - 509

Released in 1977, the Cal. 3870 with design code 509 was part of Seiko's domestic market collection. It features a Blue Sunburst dial protected by a Mineral crystal and offers 120m of water resistance. [seikata-wm-1f88fae33ef0]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

12.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1977

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