Seiko Cal. 6638 - 554

The Seiko 6638-554 represents an important milestone in Seiko's 1970 lineup. Powered by the 6638 caliber with 35j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-abfd98bcb8b6]

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

34mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Black

Jewels

35j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1970

Related Models

• Seiko 7111-625
• Seiko 7141-131
• Seiko 6152-224
• Seiko 4478-644
• Seiko 5688-596
• Seiko 4491-332
• Seiko 6656-640
• Seiko 5680-929
• Seiko 6677-722
• Seiko 6276-944
• Seiko 5666-739
• Seiko 5213-333