Seiko Cal. 3840 - 639

Released in 1969, the Cal. 3840 with design code 639 was part of Seiko's domestic market collection. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 80m of water resistance. [seikata-wm-dec9cbf1ed9d]

Also known as: Shogun, World Timer

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

44mm

Case Thickness

10.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1969

Related Models

• Seiko 6144-188
• Seiko 6148-250
• Seiko 0783-237
• Seiko 6127-582
• Seiko 5678-275
• Seiko 6332-720
• Seiko 6363-798
• Seiko 6281-997
• Seiko 6249-642
• Seiko 3825-442
• Seiko 5289-373
• Seiko 7071-901