An all-analog diver's watch equipped with a depth gauge. By making the approachable feel and excellent legibility of analog the key point and trimming away unnecessary functions as much as possible, it thoroughly pursues ease of use to enhance benefits.
Cal. B740 simultaneously displays the time and depth—both essential for diving—by means of hands. A depth hand is arranged coaxially with the hour and minute hands, so you can easily read the current depth by the angle of the hands with the same familiar watch sense. Specifically, since each minute track corresponds to 1 meter, you can know the depth by which “minute” the depth hand indicates, allowing you to see at a glance how many meters you can descend. This is effective even in the dark thanks to luminescent hands.
There are broadly two types of register rings. One places a knurled cut around the entire circumference so you turn it by catching your finger with friction. The other places about six large blocks that you grasp to turn. This model is the former, and because it has a volcano-like shape, even the pad of your finger catches, making it very easy to turn.
Regarding the back shape of the case, the protrusion beneath the sensor is covered with a gentle curved surface for a unified finish. The composition of complex three-dimensional curves also sits very comfortably on the wrist, conveying a sense of kindness.
Because the depth markings are laid out at the same angles as a familiar analog watch, you can read depth just from the angle of the hand. Also, the 3 / 6 / 9 m markings are designed for clarity because the unit used for decompression in diving is 10 feet, approximately 3 meters. Since the depth hand is positioned above the hour and minute hands, the depth can be read from any situation or angle.
The knurled cuts of the register ring are arranged all around in a volcano-like shape, so you can turn it by catching the pad of your finger with friction without requiring much gripping force. Its height also imparts a dynamic impression.
Although the sensor protrudes below the mating surface of the case and the case back, the back of the case is finished with a gentle curved surface that covers it to create a sense of unity. The configuration of complex three-dimensional curves prioritizes fit, resulting in a back shape that feels good on the wrist.
ENGINEER'S EYE
Aqualand with Eco-Drive
A diver's watch equipped with the world's first analog light-powered movement with an electronic depth meter.
Within the expansion of Eco-Drive variations, this model converts to Eco-Drive based on Cal. 3740, a diver's watch featuring a highly popular analog depth meter and chronograph function.
To realize the depth meter function—which requires high current—on Eco-Drive, where available power is limited, we newly developed a low-power depth measurement system that operates even with a small rechargeable battery. In addition, we added a power reserve function that displays remaining battery level in three stages to ensure safe diving.
Normally, a round luminous dot is attached at the 12 o'clock position on a diver's watch bezel, but for design reasons we definitely wanted to mark the number "60" there. This model is also the first to apply luminescence directly to the numeral (60) and incorporate measures to prevent it from peeling off.