Seiko Cal. 4487 - 725

Released in 1972, the Cal. 4487 with design code 725 was part of Seiko's domestic market collection. Powered by the 4487 caliber with 20j jewels beating at 28,800 bph, it delivers a 59 hours power reserve. [seikata-wm-59bc19cb8b72]

Also known as: Helmet, Navigator

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

11.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1972

Related Models

• Seiko 6145-409
• Seiko 4511-505
• Seiko 4554-863
• Seiko 6685-100
• Seiko 4515-457
• Seiko 3847-361
• Seiko 6353-545
• Seiko 4582-935
• Seiko 5699-101
• Seiko 6692-887
• Seiko 6354-725
• Seiko 6125-578