Seiko Cal. 7155 - 731

Released in 1969, the Cal. 7155 with design code 731 was part of Seiko's domestic market collection. It features a Navy dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-fb8a4caba4fa]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

43mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1969

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