Seiko Cal. 4540 - 438

This Solar model from 1969 features a 41mm PVD Black case. Powered by the 4540 caliber with 29j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-6f5642ce47dd]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

41mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1969

Related Models

• Seiko 6185-855
• Seiko 5640-142
• Seiko 7099-577
• Seiko 4527-623
• Seiko 6129-675
• Seiko 0728-792
• Seiko 0784-715
• Seiko 6395-348
• Seiko 0753-952
• Seiko 0714-730
• Seiko 6220-814
• Seiko 5245-449