Seiko Cal. 6644 - 243

Released in 1968, the Cal. 6644 with design code 243 was part of Seiko's domestic market collection. It features a Silver dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-50755a0bc8d6]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

15.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Silver

Jewels

19j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1968

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