Seiko Cal. 6648 - 937

The 6648-937 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Navy dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-8c6bad57da3d]

Also known as: Monster, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

15.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1973

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