Seiko Cal. 5647 - 991

The Seiko 5647-991 represents an important milestone in Seiko's 1976 lineup. Powered by the 5647 caliber with 21j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-08887765d70a]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1976

Related Models

• Seiko 5220-978
• Seiko 0783-352
• Seiko 7010-719
• Seiko 3840-663
• Seiko 4528-378
• Seiko 7073-131
• Seiko 0792-222
• Seiko 5288-994
• Seiko 3887-130
• Seiko 7152-372
• Seiko 6645-539
• Seiko 7044-129