Seiko Cal. 4540 - 318

This Automatic model from 1975 features a 37mm Two-Tone case. It features a Black dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-cb55fc1c40a1]

Also known as: UFO, Baby Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Black

Jewels

22j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1975

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