Seiko Cal. 6631 - 620

Seiko 6631-620

The 6631-620 is a sought-after Solar piece from Seiko's golden era. Powered by the 6631 caliber with 20j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-1f7f356a5442]

Also known as: Rally, Golden Tuna

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
41mm
Case Thickness
10.3mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
50m
Dial Color
Black
Jewels
20j
Frequency
28,800 bph
Power Reserve
62 hours
Year
1967

Related Models

seikata-wm-1f7f356a5442