Casio MTD-140-3A Men's Green Dial Marine Sports Watch

The Casio MTD-140-3A is a men's marine sports watch with a green dial and a black resin band. It is made for men who want one watch for swimming, snorkelling and everyday wear, and its 100-metre water resistance is the feature that sets it apart from a standard casual watch.

The stainless steel case and bezel give the Casio MTD-140-3A a silver metal surround that helps shield the quartz movement from knocks. A date window sits at 3 o'clock, and the hands and geometric index markers are luminous so you can read the time in low light. The green dial adds contrast, while the pin buckle keeps the black resin strap secure during active use. This Casio marine sports watch uses an analog three-hand layout, so there are no digital menus to step through when you want a quick time check.

Key features and benefits of the Casio MTD-140-3A Marine Sports Watch

• 100-metre water resistance (10 bar): The Casio MTD-140-3A is rated for swimming and snorkelling, so pool sessions and coastal swims do not call for a different watch. It is a marine sports rating, not a scuba diving rating.
• Luminous hands and index markers: The thick hands and geometric markers glow after light exposure, which helps you read the time at night or in dim water. The green dial behind them adds contrast.
• Green dial with geometric markers: The green face and applied markers give the watch a look that moves from beach wear to office wear. The colour also helps the dial stand out in murky water.
• Stainless steel case and bezel: A silver stainless steel case and bezel surround the dial and help protect the movement from everyday knocks. Stainless steel also gives the watch a metal finish while the resin band keeps the weight down.
• Black resin band with pin buckle: The resin strap is flexible and resists sweat, salt water and UV exposure. A pin buckle keeps the band closed during swimming and other active use.
• Date window at 3 o'clock: A small calendar window shows the day of the month, so you can check the date without reaching for a phone. White numerals on a dark background make it easy to glance at.
• Analog three-hand display: The Casio MTD-140-3A uses a traditional analog layout with hour, minute and second hands. That makes it simple to read at a glance, with no menus or digital buttons to navigate.
• Quartz analog movement: A quartz movement powers the hands and provides regular timekeeping. It is a battery-powered analog movement, so the watch has no mechanical winding routine.
• Marine Sports Series design: The watch belongs to Casio's Marine Sports line, which pairs water-sports function with a clean everyday look. It suits men who want one watch for the water and the office.
• Replaceable band fitting: The resin band is held by standard spring bars, so it can be swapped for another strap of the same lug width. The pin buckle stays with the band.

Who the Marine Sports Watch Is For

The Casio MTD-140-3A suits men who want a single watch for swimming, snorkelling, sailing and daily wear. Its 100-metre water resistance covers surface water sports, and the luminous dial helps with early-morning or evening sessions. The stainless steel case and green dial give it a neat look for work, while the black resin band keeps it practical in warm, wet conditions.

• Daily wear for professionals who swim before or after work
• Weekend snorkelling trips and boat outings
• Outdoor training where a secure, readable watch is useful
• Travel where one watch must handle wet and dry conditions
• Everyday office wear when a green dial and metal case suit the dress code

Less suitable if: you need a watch for scuba diving or prefer a metal bracelet instead of a resin strap. The Casio MTD-140-3A is rated to 100 metres for surface water sports and comes with a black resin band.

Casio MTD-140-3A Watch Specifications

Using and caring for the Casio MTD-140-3A

Rinse the Casio MTD-140-3A with fresh water after salt water or chlorine exposure, then dry it with a soft cloth. Keep the crown pressed in before swimming, and avoid pressing any buttons underwater. Clean the stainless steel case and resin band with mild soap and a soft cloth when needed, and store the watch in a cool, dry place.

• Rinse under lukewarm running water after sea or pool swimming
• Wipe the case and band with a damp cloth; avoid harsh chemicals or solvents
• Check the crown is fully pushed in before water activity
• Store in a cool, dry place away from direct sunlight
• Have the water resistance seals checked by a watch professional every two years

How to choose a marine sports watch

Water resistance comes first: the Casio MTD-140-3A is rated to 100 metres (10 bar), which covers swimming and snorkelling but not scuba diving. Case material affects how the watch handles knocks, and this model uses a stainless steel case and bezel. Band material matters in wet conditions; the black resin strap here is flexible and quick to dry. Check luminous treatment and dial contrast for low-light reading, because the green dial and luminous hands on this watch are made for that job. A date window adds daily convenience, and this watch places one at 3 o'clock.

Frequently asked questions

What is the Casio MTD-140-3A?

It is a men's marine sports watch from Casio with a green dial, stainless steel case and black resin band. The model is rated to 100 metres (10 bar) for surface water sports.

How water resistant is the Casio MTD-140-3A?

The watch is rated to 100 metres (10 bar), which suits swimming, snorkelling and surface water sports. It is not intended for scuba diving.

What are the case and band made of?

The case and bezel are stainless steel, and the band is black resin with a pin buckle. The resin strap is flexible and resists salt water and sweat.

Does the Casio MTD-140-3A have a luminous display?

The hands and geometric index markers are luminous, so they glow after exposure to light. The green dial adds contrast around the glowing markers.

Is there a date display?

Yes, a date window sits at 3 o'clock and shows the day of the month. White numerals on a dark background make it easy to read.

Who is the Casio MTD-140-3A designed for?

It suits men who want one watch for swimming, snorkelling and everyday office wear. The 100-metre rating and luminous dial help with active use, while the green dial and steel case keep the look neat.

Can I change the band on the Casio MTD-140-3A?

The resin band uses standard spring bars, so it can be replaced with another strap of the same lug width. The pin buckle is part of the band.

What movement does the watch use?

The Casio MTD-140-3A uses a quartz analog movement with hour, minute and second hands. It is battery powered and needs no mechanical winding.