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Geplaatst op 06-05-2026 door marc hut
The Citizen NY0040 is a genuine Promaster Mechanical Diver with ISO 6425 certification, 200-metre water resistance and an automatic Citizen movement. Its straightforward design and practical diving specifications have given it lasting appeal among watch enthusiasts.
At 42 mm, the NY0040 combines the proportions of a modern sports watch with the functional details expected from a proper diver: a screw-down crown, rotating bezel, luminous dial and water-resistant rubber strap.
In this guide, we look at the technology, dimensions and diving features of the NY0040 and compare the black NY0040-09EE with the blue NY0040-17LE.
Citizen NY0040-09EE Promaster Mechanical Diver in black.
The Citizen NY0040 is not simply a sports watch styled to look like a diver. It belongs to Citizen's professional Promaster Marine range and is designed around the requirements of an actual diving watch.
ISO 6425 certification is particularly relevant. The international diving-watch standard covers requirements relating to water resistance, underwater readability and other functional aspects of a watch intended for diving.
The NY0040 is therefore a logical model to compare with the wider WatchXL range of ISO-certified diving watches.
If you want to compare different brands and technologies rather than Citizen alone, browse all dive watches at WatchXL.
The NY0040 uses a relatively simple specification, but the details are appropriate for its intended purpose.
The watch is rated to 200 metres and is designed as an ISO-certified diver rather than merely a water-resistant everyday watch.
The diving bezel can be used to monitor elapsed time. The same feature can also be useful away from the water for timing everyday activities.
The screw-down construction supports the water-resistant design of the case. Always make sure the crown is properly secured before the watch is used in water.
Clear luminous elements make the dial easier to read in low-light conditions, an essential characteristic of a functional diving watch.
The NY0040 uses toughened mineral crystal rather than sapphire. That keeps the specification straightforward, while the raised bezel also provides some physical protection around the crystal.
The NY0040 combines a screw-down crown with a screw-down case back.
An automatic watch stores mechanical energy in a mainspring. A rotor inside the movement turns as you move your wrist and helps wind the watch during normal wear.
There is therefore no conventional quartz battery powering the movement. If the watch is left unworn for longer than its available power reserve, it will eventually stop and the time and calendar will need to be set again.
This is part of the appeal for many enthusiasts. The NY0040 is not trying to offer the low-maintenance behaviour of Citizen Eco-Drive; it is a traditional mechanical diving watch.
If mechanical movements are one of your main reasons for considering the NY0040, compare it with other automatic watches at WatchXL.
You can also browse WatchXL's dedicated selection of Citizen mechanical watches.
Both current NY0040 versions have a stainless-steel case approximately 42 mm in diameter and 12 mm thick.
Those dimensions make the watch substantial enough to look like a proper sports watch without reaching the oversized proportions found on some modern professional divers.
The rubber strap is particularly appropriate around water and keeps the overall construction straightforward. Citizen lists the current European versions at approximately 94 grams, making them relatively manageable for a mechanical 200-metre diver.
Case diameter alone never tells the complete story, however. Wrist shape, lug design and strap fit all affect how a watch feels.
If you are comparing the NY0040 with different styles and brands, it also sits naturally within WatchXL's wider collection of men's watches.
One of the most recognisable elements of the NY0040 is its offset crown on the left side of the case, around the 8 o'clock position.
For a watch normally worn on the left wrist, this keeps the crown away from the back of the hand. That can improve comfort when the wrist is bent during swimming, sports or other active use.
The unusual crown placement also gives the NY0040 a distinctive visual identity. Even from a distance, it helps separate the design from many conventional diving watches with a crown at 3 or 4 o'clock.
The two versions currently available at WatchXL share the important technical characteristics. Your choice is therefore primarily visual.
Choose the NY0040-09EE if you prefer the traditional professional-diver look. The black dial, dark bezel and black rubber strap create the most understated and tool-oriented version.
Choose the NY0040-17LE if you want the same mechanical-diver character with a more obvious maritime colour scheme. Its blue dial and blue rubber strap make it the more colourful option.
Both are 42 mm automatic Promaster divers with ISO 6425 certification, 20 bar water resistance, luminous markers and toughened mineral crystal.
The blue NY0040-17LE uses the same functional diving concept in a more colourful finish.
WatchXL currently supplies the NY0040 models with Citizen's distinctive diving-cylinder-style presentation box.
It is a small detail, but one that fits the Promaster Marine identity particularly well and makes the watch more interesting as a gift.
The presentation box does not change the technical qualities of the watch, of course, so we would still choose between the black and blue versions based primarily on which one you actually prefer to wear.
The NY0040 is only one part of Citizen's extensive marine-watch range.
Models such as the NY0086 and newer Promaster Mechanical Diver references retain an automatic movement but offer different dial, bracelet and case combinations.
If you prefer light-powered quartz accuracy and less need to reset the watch after periods of non-use, an Eco-Drive Promaster Marine may suit you better than an automatic NY0040.
For divers who want additional instruments such as an electronic depth sensor, Citizen also offers more technical Promaster Marine and Aqualand models.
Compare these options in the complete Citizen Promaster Marine collection.
The NY0040 makes the most sense if the combination of an automatic movement, ISO-certified diving construction and classic Promaster design appeals to you.
Its toughened mineral crystal and approximately 40–42-hour power reserve are not class-leading specifications in isolation. That is also not really the point of this model. Its appeal lies in combining a proven mechanical layout with genuine diving credentials in a relatively compact 42 mm package.
Choose black if you want the classic tool-watch appearance. Choose blue if you want the same functional design with more colour.
If automatic technology is not important to you, compare the NY0040 with Citizen's Eco-Drive Promaster divers before deciding. If diving certification is your priority, use WatchXL's ISO-certified dive watch collection to compare suitable alternatives.
The lasting appeal of the Citizen NY0040 is easy to understand. It gives you an automatic mechanical movement, ISO 6425 diving credentials, 200-metre water resistance, a functional rotating bezel and a highly recognisable Promaster design.
It is not the most complicated Citizen diver and it does not need to be. The NY0040 is at its best as a simple, functional automatic sports watch that can genuinely be used in and around the water.
View the black Citizen NY0040-09EE, the blue Citizen NY0040-17LE or compare all Citizen Promaster Marine watches at WatchXL.
Want to compare the NY0040 with other marine watches? Browse all dive watches at WatchXL.
Interested in other mechanical Citizen models? Explore the complete selection of Citizen automatic watches.
Still deciding between mechanical and light-powered technology? Read our guide comparing an automatic watch with Citizen Eco-Drive.
For the complete range, browse all Citizen watches or all men's watches at WatchXL.
