Seiko Cal. 0721 - 428

The 0721-428 is a sought-after Solar piece from Seiko's golden era. It features a Navy dial protected by a Hardlex crystal and offers 170m of water resistance. [seikata-wm-92a47197df68]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

23j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1970

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