Seiko Cal. 6378 - 438

The 6378-438 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6378 caliber with 26j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-d38faa483caf]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

9.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Burgundy

Jewels

26j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1965

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