Seiko Cal. 3856 - 977

The Seiko 3856-977 represents an important milestone in Seiko's 1975 lineup. Powered by the 3856 caliber with 21j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-9e123f587393]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

40mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Silver

Jewels

21j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1975

Related Models

• Seiko 6679-319
• Seiko 6658-717
• Seiko 4415-224
• Seiko 4590-196
• Seiko 6173-622
• Seiko 4445-622
• Seiko 6211-213
• Seiko 6378-399
• Seiko 6263-549
• Seiko 6322-932
• Seiko 6398-254
• Seiko 0730-154