Seiko Cal. 3890 - 437

The 3890-437 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-4305cf34efe3]

Also known as: Monster, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1965

Related Models

• Seiko 6624-712
• Seiko 5213-582
• Seiko 7072-391
• Seiko 7055-836
• Seiko 6646-610
• Seiko 6698-219
• Seiko 5627-953
• Seiko 5652-841
• Seiko 6153-321
• Seiko 7025-931
• Seiko 7099-809
• Seiko 4474-487