Seiko Cal. 4540 - 748

The 4540-748 is a sought-after Solar piece from Seiko's golden era. Powered by the 4540 caliber with 32j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-ba623ce32b3d]

Also known as: Tuna, Navigator

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Cream

Jewels

32j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1970

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