Seiko Cal. 5640 - 656

This Hand-Winding model from 1976 features a 41mm PVD Black case. Powered by the 5640 caliber with 32j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-020b91252bba]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

11.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1976

Related Models

• Seiko 4569-280
• Seiko 0756-766
• Seiko 6694-861
• Seiko 4521-622
• Seiko 5663-825
• Seiko 3896-956
• Seiko 6269-960
• Seiko 6166-104
• Seiko 4469-355
• Seiko 4522-835
• Seiko 3840-796
• Seiko 5213-680