Seiko Cal. 6617 - 307

The Seiko 6617-307 represents an important milestone in Seiko's 1968 lineup. Powered by the 6617 caliber with 33j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-d76e818696ea]

Also known as: Sumo, Bellmatic

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1968

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