Seiko Cal. 6638 - 797

Seiko 6638-797

The 6638-797 is a sought-after Solar piece from Seiko's golden era. Powered by the 6638 caliber with 25j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-a02f395fbf99]

Also known as: Helmet

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
43mm
Case Thickness
13.2mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
70m
Dial Color
Champagne
Jewels
25j
Frequency
28,800 bph
Power Reserve
61 hours
Year
1989

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