Seiko Cal. 0721 - 436

The Seiko 0721-436 represents an important milestone in Seiko's 1971 lineup. Powered by the 0721 caliber with 36j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-644dcd0a5df3]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

8.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Black

Jewels

36j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1971

Related Models

• Seiko 5295-811
• Seiko 6314-732
• Seiko 4592-779
• Seiko 4543-412
• Seiko 3816-248
• Seiko 7074-802
• Seiko 7068-479
• Seiko 4573-101
• Seiko 5283-827
• Seiko 7062-480
• Seiko 6179-882
• Seiko 6626-178