Seiko Cal. 5637 - 448

Released in 1966, the Cal. 5637 with design code 448 was part of Seiko's domestic market collection. It features a Silver dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-cc441fc59765]

Also known as: World Timer, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Silver

Jewels

22j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1966

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