Seiko Cal. 6638 - 540

This Hand-Winding model from 1969 features a 43mm PVD Black case. Powered by the 6638 caliber with 25j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-8ae9cac20d6f]

Also known as: Pogue, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

43mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

25j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1969

Related Models

• Seiko 5672-185
• Seiko 5251-581
• Seiko 5258-488
• Seiko 6289-826
• Seiko 7182-399
• Seiko 0778-264
• Seiko 7158-307
• Seiko 6367-515
• Seiko 4451-273
• Seiko 6250-949
• Seiko 5681-392
• Seiko 5659-494