Seiko Cal. 5638 - 438

Seiko 5638-438

Released in 1984, the Cal. 5638 with design code 438 was part of Seiko's domestic market collection. Powered by the 5638 caliber with 19j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-f637c87816db]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
9.7mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
190m
Dial Color
White
Jewels
19j
Frequency
36,000 bph
Power Reserve
51 hours
Year
1984

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