Seiko Cal. 4510 - 991

Released in 1969, the Cal. 4510 with design code 991 was part of Seiko's domestic market collection. With its 22mm lug width and 13.7mm profile, it sits comfortably on most wrists. [seikata-wm-bbf6fb171e60]

Also known as: Sumo, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1969

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