Seiko Cal. 4487 - 930

This Spring Drive model from 1975 features a 45mm Two-Tone case. Powered by the 4487 caliber with 24j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-11e5e0a058e0]

Also known as: Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

45mm

Case Thickness

12.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1975

Related Models

• Seiko 6152-934
• Seiko 3856-790
• Seiko 6376-436
• Seiko 6258-286
• Seiko 7090-763
• Seiko 4426-369
• Seiko 6352-418
• Seiko 0780-124
• Seiko 6113-177
• Seiko 6230-437
• Seiko 6695-597
• Seiko 6279-498