Seiko Cal. 3891 - 947

This Spring Drive model from 1975 features a 36mm Titanium case. Powered by the 3891 caliber with 36j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-e35554bd9253]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

15.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1975

Related Models

• Seiko 6352-184
• Seiko 7128-961
• Seiko 4587-110
• Seiko 0790-852
• Seiko 5641-769
• Seiko 0775-491
• Seiko 5241-555
• Seiko 7138-547
• Seiko 4426-782
• Seiko 3812-726
• Seiko 3829-154
• Seiko 6347-406