Seiko Cal. 6638 - 392

The 6638-392 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6638 caliber with 25j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-db5930e09cfb]

Also known as: Bullhead, Rally

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Silver

Jewels

25j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1991

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