Seiko Cal. 6638 - 395

This Spring Drive model from 1991 features a 42mm PVD Black case. Powered by the 6638 caliber with 20j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-621455bfea57]

Also known as: Monster, World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Burgundy

Jewels

20j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1991

Related Models

• Seiko 6135-529
• Seiko 7197-223
• Seiko 6139-514
• Seiko 7144-631
• Seiko 7118-723
• Seiko 5247-992
• Seiko 6131-173
• Seiko 5674-960
• Seiko 5682-963
• Seiko 6669-625
• Seiko 6286-117
• Seiko 6178-188