Seiko Cal. 4427 - 902

This Spring Drive model from 1975 features a 39mm Two-Tone case. Powered by the 4427 caliber with 17j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-118690c8dcbe]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

13.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Champagne

Jewels

17j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1975

Related Models

• Seiko 6263-652
• Seiko 7036-827
• Seiko 4559-442
• Seiko 6194-507
• Seiko 7118-112
• Seiko 4483-752
• Seiko 4474-774
• Seiko 6167-233
• Seiko 5680-117
• Seiko 6331-182
• Seiko 0753-163
• Seiko 6625-737