Seiko Cal. 6640 - 368

This Solar model from 1968 features a 42mm Gold-Plated case. With its 20mm lug width and 12.4mm profile, it sits comfortably on most wrists. [seikata-wm-608403a725b1]

Also known as: Goldfeather

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Silver

Jewels

18j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1968

Related Models

• Seiko 6375-731
• Seiko 7156-801
• Seiko 4480-326
• Seiko 4481-396
• Seiko 6380-472
• Seiko 0772-629
• Seiko 6112-542
• Seiko 6355-448
• Seiko 4441-180
• Seiko 5618-228
• Seiko 6199-310
• Seiko 4522-934