Seiko Cal. 4540 - 277

Released in 1969, the Cal. 4540 with design code 277 was part of Seiko's domestic market collection. Powered by the 4540 caliber with 23j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-9b7f7c47a2a4]

Also known as: Sumo, Sea Horse

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

23j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1969

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