Seiko Cal. 5640 - 441

This Solar model from 1978 features a 40mm Hardlex-Coated Steel case. With its 21mm lug width and 12.0mm profile, it sits comfortably on most wrists. [seikata-wm-95354093eb4c]

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

12.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Silver

Jewels

24j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1978

Related Models

• Seiko 3849-131
• Seiko 6633-811
• Seiko 4543-815
• Seiko 6285-794
• Seiko 3826-588
• Seiko 6646-167
• Seiko 7162-517
• Seiko 6194-924
• Seiko 6135-346
• Seiko 0761-585
• Seiko 7088-494
• Seiko 0785-154