Seiko Cal. 4436 - 639

The Seiko 4436-639 represents an important milestone in Seiko's 1968 lineup. It features a Silver dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-98e33d2a7f24]

Also known as: Tuna, Arnie

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

38mm

Case Thickness

15.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Silver

Jewels

18j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1968

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