Seiko Cal. 6638 - 725

Seiko 6638-725

The 6638-725 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6638 caliber with 26j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-f6ba62949def]

Also known as: Bullhead, Helmet

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
34mm
Case Thickness
8.4mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
50m
Dial Color
Silver
Jewels
26j
Frequency
21,600 bph
Power Reserve
71 hours
Year
1966

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