Seiko Cal. 3815 - 674

This Automatic model from 1972 features a 38mm Hardlex-Coated Steel case. Powered by the 3815 caliber with 31j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-ccd007dafb4a]

Also known as: Tuna, Goldfeather

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1972

Related Models

• Seiko 6391-531
• Seiko 5675-398
• Seiko 6645-947
• Seiko 5685-754
• Seiko 7040-350
• Seiko 6617-937
• Seiko 0772-608
• Seiko 4480-810
• Seiko 4495-188
• Seiko 5616-799
• Seiko 4442-499
• Seiko 7091-383