Seiko Cal. 5639 - 445

This Spring Drive model from 1986 features a 35mm Two-Tone case. Powered by the 5639 caliber with 35j jewels beating at 36,000 bph, it delivers a 69 hours power reserve. [seikata-wm-0454f44c51e9]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

10.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1986

Related Models

• Seiko 7099-112
• Seiko 7121-213
• Seiko 6615-458
• Seiko 4556-730
• Seiko 7063-254
• Seiko 6361-396
• Seiko 7140-463
• Seiko 5636-727
• Seiko 5619-385
• Seiko 7030-411
• Seiko 6677-477
• Seiko 4451-308