Seiko Cal. 3878 - 991

Seiko 3878-991

The Seiko 3878-991 represents an important milestone in Seiko's 1977 lineup. Powered by the 3878 caliber with 27j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-4e6339e60324]

Also known as: Sumo, Baby Tuna

Specifications

Movement
Quartz
Case Material
PVD Black
Case Width
46mm
Case Thickness
8.5mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
80m
Dial Color
Burgundy
Jewels
27j
Frequency
36,000 bph
Power Reserve
54 hours
Year
1977

Related Models

seikata-wm-4e6339e60324