Seiko Cal. 3815 - 557

This Spring Drive model from 1965 features a 44mm PVD Black case. With its 18mm lug width and 11.8mm profile, it sits comfortably on most wrists. [seikata-wm-57d6ca94d0db]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Silver

Jewels

31j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1965

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