Seiko Cal. 3870 - 650

The Seiko 3870-650 represents an important milestone in Seiko's 1970 lineup. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-e48b242039ff]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

46mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Navy

Jewels

29j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1970

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