Seiko Cal. 3881 - 945

The Seiko 3881-945 represents an important milestone in Seiko's 1967 lineup. Powered by the 3881 caliber with 35j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-89502666ccd8]

Also known as: Monster, Sportsmatic

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Navy

Jewels

35j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1967

Related Models

• Seiko 6649-912
• Seiko 4538-518
• Seiko 7032-866
• Seiko 0738-570
• Seiko 6195-892
• Seiko 5284-851
• Seiko 7198-109
• Seiko 5234-351
• Seiko 6685-882
• Seiko 5629-573
• Seiko 5233-802
• Seiko 7112-609