Seiko Cal. 5257 - 631

Released in 1972, the Cal. 5257 with design code 631 was part of Seiko's domestic market collection. It features a Black dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-9af057cb71e5]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

41mm

Case Thickness

13.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1972

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