Seiko Cal. 4436 - 381

This Spring Drive model from 1972 features a 37mm Stainless Steel case. With its 19mm lug width and 8.0mm profile, it sits comfortably on most wrists. [seikata-wm-dfc7939e0731]

Also known as: Tuna, Rally

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Burgundy

Jewels

19j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1972

Related Models

• Seiko 6147-457
• Seiko 6363-650
• Seiko 7049-404
• Seiko 6287-645
• Seiko 6210-417
• Seiko 6631-545
• Seiko 6118-539
• Seiko 3872-688
• Seiko 6165-936
• Seiko 4426-347
• Seiko 7144-612
• Seiko 6166-651