Seiko Cal. 5640 - 498

The 5640-498 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-7d39a52b4ab0]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

9.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Green

Jewels

35j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1990

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