Seiko Cal. 6378 - 253

The Seiko 6378-253 represents an important milestone in Seiko's 1971 lineup. It features a Black dial protected by a Sapphire crystal and offers 70m of water resistance. [seikata-wm-0651b43c151f]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

13.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1971

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