Seiko Cal. 4438 - 657

The 4438-657 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4438 caliber with 26j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-1dc76fb7d540]

Also known as: Panda, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

80m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1975

Related Models

• Seiko 6141-959
• Seiko 0780-704
• Seiko 4538-337
• Seiko 0722-921
• Seiko 6140-929
• Seiko 7089-788
• Seiko 7158-699
• Seiko 4453-473
• Seiko 4531-579
• Seiko 4528-628
• Seiko 7131-124
• Seiko 6612-573