Citizen Promaster Sky Eco-Drive wristwatch, steel, CA4664-60E
Stainless Steel Citizen Promaster Sky Watch with Black Dial, Chronograph and Slide Rule Bezel
The slide rule bezel gives this Citizen Promaster Sky watch the look of a pilot's tool: the scales on the bezel can be used to estimate fuel consumption, for example. The black dial has bar indexes and three subdials, and the luminous hands make it easier to read in dim light.
The round steel case is 40 mm wide and 13.20 mm thick, which makes this one of the smaller Promaster Sky models. The sapphire crystal has an anti-reflective coating, and the 20 mm wide steel bracelet has a folding clasp. Eco-Drive is charged by light, so the battery never needs replacing, and when fully charged the power reserve is approximately 270 days. Eco-Drive turns 50 years old in 2026. The water resistance of 200 m / 20 atm is enough for swimming, water sports, snorkeling and free diving, but the watch is not suitable for scuba diving.
Product number: CA4664-60E
Brand: Citizen
Collection: Promaster Sky
Category: Men's watches
Movement: Eco-Drive / Solar (Cal. B620)
Power reserve: approximately 270 days when fully charged
Accuracy: ±15 sec/month
Features: Timer / chronograph (60 min, 1/5 sec), date, 24 h display, charge indicator
Bezel: Slide rule bezel
Crystal: Sapphire crystal, anti-reflective coating
Case material: Stainless steel
Case color: Silver/gray
Case width: 40 mm
Case thickness: 13.20 mm
Shape: Round
Dial color: Black
Bracelet material: Stainless steel
Bracelet color: Silver/gray
Bracelet width (lug width): 20 mm
Clasp: Folding clasp
Case back: Screw-down
Water resistance: 200 m / 20 atm
Magnetic resistance: 4,800 A/m
Weight: 166 g
Frequently asked questions
Does the watch need a battery?
No. The Eco-Drive movement is charged by light, and when fully charged the power reserve is approximately 270 days.
What does water resistance of 200 m / 20 atm mean in use?
The watch is suitable for swimming, water sports, snorkeling, free diving and work in water. It is not suitable for scuba diving, as it is not a diver's watch. The crown and buttons must not be used underwater.
What functions does the watch have?
The watch has a chronograph (60 min, 1/5 sec), date, 24 h display and charge indicator. The bezel also has a slide rule scale.
Is the watch large on the wrist?
The case width is 40 mm, the thickness is 13.20 mm and the lug width is 20 mm. The watch weighs 166 g.
















