Seiko Cal. 7175 - 637

The 7175-637 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7175 caliber with 31j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-e10fb23a35e2]

Also known as: Tuna, Pogue

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

8.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

70m

Dial Color

Cream

Jewels

31j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1975

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