Seiko Cal. 4521 - 402

This Hand-Winding model from 1990 features a 35mm Titanium case. Powered by the 4521 caliber with 30j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-18c2147a9287]

Also known as: Helmet, Arnie

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

35mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

30j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1990

Related Models

• Seiko 6243-584
• Seiko 6386-390
• Seiko 7144-409
• Seiko 6248-135
• Seiko 6266-340
• Seiko 7160-528
• Seiko 5633-193
• Seiko 6290-438
• Seiko 5240-638
• Seiko 7067-275
• Seiko 7197-329
• Seiko 3816-489