Seiko Cal. 6638 - 839

Seiko 6638-839

The 6638-839 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6638 caliber with 26j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-d489345be831]

Also known as: UFO

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
38mm
Case Thickness
11.2mm
Lug Width
19mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
120m
Dial Color
Champagne
Jewels
26j
Frequency
28,800 bph
Power Reserve
42 hours
Year
1981

Related Models

seikata-wm-d489345be831