Seiko Cal. 5644 - 378

The 5644-378 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5644 caliber with 31j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-2ca6c8c6cb32]

Also known as: Bullhead, Silverwave

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Cream

Jewels

31j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1980

Related Models

• Seiko 0764-412
• Seiko 7177-265
• Seiko 6257-461
• Seiko 7151-721
• Seiko 6688-672
• Seiko 4529-563
• Seiko 7122-284
• Seiko 6198-805
• Seiko 3890-272
• Seiko 6699-546
• Seiko 7054-786
• Seiko 5219-705