Seiko Cal. 5621 - 721

The Seiko 5621-721 represents an important milestone in Seiko's 1973 lineup. Powered by the 5621 caliber with 31j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-b0c8ab046866]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1973

Related Models

• Seiko 6641-415
• Seiko 6299-578
• Seiko 6653-201
• Seiko 6617-736
• Seiko 3810-809
• Seiko 6129-213
• Seiko 3826-477
• Seiko 0725-473
• Seiko 6179-390
• Seiko 4490-571
• Seiko 7187-258
• Seiko 4417-921