Seiko Cal. 3877 - 645

The Seiko 3877-645 represents an important milestone in Seiko's 1973 lineup. Powered by the 3877 caliber with 19j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-c44bc43fdd6b]

Also known as: Turtle, Samurai

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

White

Jewels

19j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1973

Related Models

• Seiko 7023-100
• Seiko 5653-846
• Seiko 5255-101
• Seiko 6697-719
• Seiko 4540-422
• Seiko 7164-297
• Seiko 0747-985
• Seiko 7195-474
• Seiko 7093-429
• Seiko 5626-486
• Seiko 6694-391
• Seiko 3841-643