Seiko Cal. 6638 - 865

Seiko 6638-865

The 6638-865 is a sought-after Solar piece from Seiko's golden era. Powered by the 6638 caliber with 33j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-00ad2bb11b2c]

Also known as: Sumo, Bellmatic

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
41mm
Case Thickness
11.7mm
Lug Width
20mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
150m
Dial Color
Burgundy
Jewels
33j
Frequency
28,800 bph
Power Reserve
36 hours
Year
1994

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