Seiko Cal. 3820 - 654

Released in 1981, the Cal. 3820 with design code 654 was part of Seiko's domestic market collection. It features a Navy dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-bb48bc53aa94]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1981

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