Photo: Tempus Shop
MTDelta Coeur Ouvert Noir Acier
The MTDelta Coeur Ouvert Noir Acier is an automatic watch, 40 mm across, with a sapphire crystal, water-resistant to 100 m. It was listed at €385 at Tempus at our check on 12 November 2026. It costs 35% more than the median of the 34 automatic MDT watches in the catalogue (€285).
Where to buyChecked 12 November 2026
The button leads to today’s price. Affiliate link: the retailer pays us a commission, at no extra cost to you.
Who it suits
Anyone who wants one mechanical watch for every day, swimming included.
Strengths
Automatic movement · Sapphire crystal · Water-resistant to 100 m
Limits
No limit found on the spec sheet.
Our view
A good choice at this price
Of 78 automatic watches within 20% of its price, only 11 are better equipped (crystal, water resistance, titanium).
Depending on what you want
- If you dive, the Orient Mako RA-AA0824L39B goes down to 200 m for €379.
- If you want to spend less without losing anything on the spec sheet, the Casio Edifice Automatique EFK-200CD-1AER costs €299.
- If you like the model but not this version, see the MTDelta Coeur Ouvert Vert, at €385.
Reading the spec sheet
What the spec sheet says
- Automatic movement. It winds itself on the wrist, with no battery, using calibre Miyota Automatique 82S5.
- Sapphire crystal. The most scratch-resistant option.
- Water-resistant to 100 m. You can swim with it.
Analysis based on the retailer’s spec sheet, without handling the watch.
- Brand
- MDT
- Calibre
- Miyota Automatique 82S5
- Case material
- 316L steel
- Strap material
- Stainless steel
- Diameter
- 40mm
- Crystal
- Sapphire crystal
- Movement
- Automatic
- Thickness
- 12mm
- Water resistance
- 100 m (10 bar)
- Dial colour
- Black
- Clasp
- Folding clasp
- Case back
- See-through
- Reference
- MTDelta
At this price
Alternatives from other brands
Same type of movement, within 20% of the price.
Questions
The short answers
Is the MTDelta Coeur Ouvert Noir Acier an automatic watch?
Yes. Its movement is automatic (calibre Miyota Automatique 82S5): it winds itself with the motion of the wrist.
Can you swim with the MTDelta Coeur Ouvert Noir Acier?
Yes. It is water-resistant to 100 m, which allows swimming.
Does the crystal of the MTDelta Coeur Ouvert Noir Acier scratch?
It has a sapphire crystal, the most scratch-resistant kind.
What size is the MTDelta Coeur Ouvert Noir Acier?
Its case measures 40 mm in diameter and 12 mm thick.
How much does the MTDelta Coeur Ouvert Noir Acier cost?
It was listed at €385 at Tempus at our check on 12 November 2026.
Where it ranks
This watch appears in
- Citizen Tsuyosa Shore "Time Slip" NJ0238-57E vs MTDelta Coeur Ouvert Noir AcierHead to head · Citizen
- Automatic watches with sapphire crystal, water-resistant to 100 m, under €50059 references
- Automatic watches, water-resistant to 100 m, under €50063 references
- Watches with sapphire crystal, water-resistant to 100 m, under €50098 references
- Automatic watches with sapphire crystal under €500102 references
- Automatic watches under €500143 references
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