Seiko Cal. 4436 - 721

Released in 1966, the Cal. 4436 with design code 721 was part of Seiko's domestic market collection. It features a Green dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-bc6e11e23e0d]

Also known as: UFO, Navigator

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

39mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1966

Related Models

• Seiko 7083-980
• Seiko 6357-920
• Seiko 5260-802
• Seiko 0795-206
• Seiko 5615-992
• Seiko 7121-824
• Seiko 6158-152
• Seiko 7047-632
• Seiko 5264-406
• Seiko 5619-160
• Seiko 7155-838
• Seiko 5613-926