Citizen Super Titanium CA4750-51A Unisex 40mm Eco-Drive Chronograph Watch – Silver Dial, Titanium Bracelet

Citizen Super Titanium CA4750-51A: A Light-Powered Chronograph in Silver Titanium

The Citizen CA4750-51A is a 40 mm Eco-Drive chronograph from the Super Titanium line. The case and the integrated bracelet are both made from Super Titanium, the dial is silver, and the crystal is anti-reflective sapphire. Instead of a conventional battery that needs regular replacement, the watch runs on a rechargeable cell that is topped up by light, and it carries a 60-minute stopwatch with a 24-hour indicator and a date window. It is a practical, understated sports chronograph that weighs only about 91 g on its bracelet, which is very light for a watch of this size and specification.

Design and Wrist Presence

At 40 mm across and about 11.6 mm thick, the CA4750-51A sits in the middle of the size range. It is large enough to read easily and carry a chronograph dial, yet compact enough to slip under a shirt cuff. Because the case and bracelet are a single tone of silver titanium, the watch looks cohesive from lug to clasp, with no contrast between the head and the strap. The round case has a fixed bezel with no rotating ring, which keeps the face clean and uncluttered. A screwed case back and a pull-out crown complete the case construction.

Because it is a 40 mm watch, our house sizing rule classes it as unisex. Citizen markets the reference as a men’s watch, but the diameter and the low weight mean it also suits smaller wrists that prefer a substantial dial.

• 40 mm round case – a balanced size that reads clearly without dominating the wrist
• Super Titanium construction – case and bracelet are the same material and the same silver shade
• Roughly 91 g in total – light enough to forget you are wearing a chronograph

The Silver Dial

The dial is silver and analogue, with line-style hour indices and silver hour and minute hands. Hands and indices are luminous, so the time can still be read when the lights are low. The chronograph layout includes a 24-hour sub-dial, which shows whether the main time is in the day or night half of the clock, and a date window on the right-hand side of the dial. The solar cells that power the watch sit beneath the dial, and Citizen integrates them into the sub-dial layout so that they can collect light without a separate window.

Retailer listings differ on the exact shade, describing it as either silver or a pale cream, so expect a light, slightly warm metallic face rather than a stark white or a dark grey one. The silver hands and indices keep the contrast moderate, which makes the watch calm to look at over a long day.

Eco-Drive Movement and Chronograph Functions

Inside the case is Citizen’s Eco-Drive calibre B620, a solar-powered quartz movement. Light falling on the dial is converted into electrical energy and stored in a rechargeable accumulator. On a full charge the watch will keep running for up to about nine months in the dark, so it can sit in a drawer between wears and still be ready. A low-charge indication warns you when the watch needs more light, and overcharge protection prevents damage from long exposure to bright light. Accuracy is rated at plus or minus 15 seconds a month.

The chronograph is a stopwatch that records up to 60 minutes and measures in one-fifth-of-a-second steps. It is started, stopped and reset from the pushers at the side of the case, and the crown is used to set the time and date.

• Light-powered – no routine battery changes, and a charge that lasts for months in the dark
• 60-minute stopwatch – timing in 1/5-second increments for everyday tasks
• 24-hour indicator – a sub-dial that separates day from night, useful when travelling
• Date window – a quick reference for the day of the month

Titanium Bracelet

The bracelet is made from the same Super Titanium as the case, in a silver finish and with solid links. It measures 20 mm where it meets the case, and it closes with a folding deployment clasp operated by push buttons, which keeps the bracelet tidy on the wrist and makes it easy to take off. The links are attached with push pins, and the bracelet can be shortened to fit wrists from around 160 mm to 210 mm. Titanium is noticeably lighter than stainless steel and tends to feel warmer against the skin, which is why it is often chosen for watches worn all day.

Sapphire Crystal and Water Resistance

The CA4750-51A has a sapphire crystal with an anti-reflective coating. Sapphire is among the most scratch-resistant materials used in watchmaking, so the dial stays clear through daily knocks, and the coating cuts glare so that the chronograph can be read quickly in bright sunlight.

Water resistance is rated at 10 ATM, or 100 metres. In practical terms that covers showering, swimming and snorkelling. It is not a diving watch, and the pushers and crown should not be operated underwater. Rinse the watch in fresh water after swimming in the sea.

The Super Titanium Collection

Citizen introduced the Super Titanium chronograph family with four colour variants of the same case and dial architecture: the CA4750-51A, along with the -51E, -51L and -51X, which differ mainly in dial colour. The shared specification is a 40 mm case, a B620 Eco-Drive movement, sapphire glass and a full titanium bracelet. Citizen is a Japanese watchmaker, and Eco-Drive is the company’s light-powered technology, which has been the centre of its range for decades. The brand has built much of its reputation on durable, practical watches that need little attention, and this reference follows that approach.

Who This Watch Suits

• Anyone who wants a chronograph without the upkeep of a battery or a winding routine
• People with sensitive skin or those who find steel watches heavy, as titanium is lighter and wears comfortably
• Travellers who value a 24-hour indicator and a water resistance rating that copes with the pool or the beach
• Wearers who prefer a single-tone silver look from the dial to the clasp
• Buyers looking for a medium-sized, versatile watch for the office and the weekend

Care and Maintenance

To keep the movement charged, let the watch spend time in daylight or under a bright lamp, ideally with the dial uncovered by a long sleeve. If it is left in the dark for an extended period, the low-charge indicator will tell you when to give it more light. Wipe the case and bracelet with a soft, slightly damp cloth, and dry it afterwards. Rinse it with fresh water after sea swimming, and keep the crown pushed in when it is in the water. The rechargeable cell is designed to last for many years, and any service should be done by a qualified watchmaker.

Technical Specifications