Seiko Cal. 4437 - 687

Seiko 4437-687

The 4437-687 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Burgundy dial protected by a Sapphire crystal and offers 70m of water resistance. [seikata-wm-c096ff9e376a]

Also known as: Helmet, Navigator

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
34mm
Case Thickness
14.9mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
70m
Dial Color
Burgundy
Jewels
24j
Frequency
21,600 bph
Power Reserve
67 hours
Year
1977

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