Seiko Cal. 5638 - 347

The Seiko 5638-347 represents an important milestone in Seiko's 1970 lineup. Powered by the 5638 caliber with 21j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-7826f0744149]

Also known as: Helmet, Silverwave

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

21j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1970

Related Models

• Seiko 7080-927
• Seiko 7181-610
• Seiko 6327-610
• Seiko 3886-182
• Seiko 4439-340
• Seiko 4429-182
• Seiko 5276-925
• Seiko 7118-573
• Seiko 4515-242
• Seiko 6399-858
• Seiko 0754-855
• Seiko 6312-660