Seiko Cal. 5640 - 394

Released in 1974, the Cal. 5640 with design code 394 was part of Seiko's domestic market collection. The Bidirectional bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-1cf111830cc7]

Also known as: Shogun, Bullhead

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

10.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Burgundy

Jewels

21j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1974

Related Models

• Seiko 7156-658
• Seiko 6221-810
• Seiko 7180-925
• Seiko 6126-612
• Seiko 0743-387
• Seiko 6294-816
• Seiko 4429-982
• Seiko 7166-580
• Seiko 4440-801
• Seiko 4577-814
• Seiko 4575-265
• Seiko 5278-229