Seiko Cal. 6643 - 503

The Seiko 6643-503 represents an important milestone in Seiko's 1975 lineup. It features a White dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-2e1484fae5f3]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

36mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

White

Jewels

18j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1975

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