Seiko Cal. 5644 - 540

The Seiko 5644-540 represents an important milestone in Seiko's 1999 lineup. Powered by the 5644 caliber with 34j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-5acec4515ffe]

Also known as: Sumo, Flighty

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

42mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

Champagne

Jewels

34j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1999

Related Models

• Seiko 5692-336
• Seiko 4481-284
• Seiko 5620-987
• Seiko 5628-162
• Seiko 4475-376
• Seiko 4450-601
• Seiko 0746-882
• Seiko 6665-607
• Seiko 7146-484
• Seiko 6692-190
• Seiko 5235-187
• Seiko 6181-727