Seiko Cal. 5665 - 631

Released in 1971, the Cal. 5665 with design code 631 was part of Seiko's domestic market collection. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-cb095bd97f43]

Also known as: Sumo, Flighty

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Black

Jewels

23j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1971

Related Models

• Seiko 6226-315
• Seiko 3875-553
• Seiko 5269-893
• Seiko 4417-109
• Seiko 6190-826
• Seiko 4573-160
• Seiko 0713-622
• Seiko 3874-335
• Seiko 4581-148
• Seiko 4421-802
• Seiko 0730-801
• Seiko 4469-411