The high-tech Clifton 10839 movement rounds out the beauty and refinement of this exclusive timepiece. The self-winding Baumatic Manufacture movement drives the mechanism in an exceptionally precise stride. It offers a strong resistance to everyday magnetic fields, up to 1500 Gauss, and its chronometer is certified by the COSC (Swiss Official Chronometer Testing Institute). It trots steadily to a frequency of 4Hz (28 800 vph). The caliber offers a remarkable freedom of autonomy thanks to its five-day (120-hour) power reserve, and is water-resistant to 5 ATM (approximately 50 m).
Origin: Switzerland
Water Resistance: 50 meters / 5 ATM
Movement Type: Automatic
Power Reserve: 120 hours
Watch Function: Time, Date
Case Shape: Round
Case Size: 40mm
Case Thickness: 11.3mm
Case back: Sapphire crystal case back, With screw
Dial Colour & Finish: Black, Sans
Strap Material: Alligator Leather
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Measure your ring size at home in minutes with our printable ring sizer and conversion chart.
How to measure your ring size
A good fit is snug enough to stay put, loose enough to slide over your knuckle. Print our ring sizer on A4 paper at 100% scale (no "fit to page") and check the 5cm line with a ruler, then choose a method below.
Download printable ring sizerUse a ring you already own
Easiest if you have a ring that fits the finger you're shopping for.
- Place your ring over the printed circles, starting with the smallest.
- Stop when the circle's outline sits just inside the ring's inner edge.
- That circle is your size.
Use the ring sizer strip
No ring to measure? The paper strip works just as well.
- Cut out the strip along the dashed line, then cut the slit.
- Wrap it around the base of your finger, printed side out.
- Feed the narrow end through the slit until it feels snug.
- Read the size where the strip meets the slit.
Between sizes? Choose the larger size.
Best time to measure: at the end of the day, when fingers are warm. Cold fingers read smaller.
Wide band? Bands 6mm and wider fit tighter, so consider going up half a size.
Ring size conversion chart
| AU / UK | US | EU | Inner diameter | Circumference |
|---|---|---|---|---|
| I | 4½ | 48 | 15.3mm | 48.0mm |
| J | 5 | 49 | 15.7mm | 49.3mm |
| K | 5½ | 50 | 16.1mm | 50.6mm |
| L | 6 | 52 | 16.5mm | 51.9mm |
| M | 6½ | 53 | 16.9mm | 53.1mm |
| N | 7 | 54 | 17.3mm | 54.4mm |
| O | 7½ | 56 | 17.7mm | 55.7mm |
| P | 8 | 57 | 18.1mm | 57.0mm |
| Q | 8½ | 58 | 18.5mm | 58.3mm |
| R | 9 | 60 | 18.9mm | 59.5mm |
| S | 9½ | 61 | 19.4mm | 60.8mm |
| T | 10 | 62 | 19.8mm | 62.1mm |
| U | 10½ | 63 | 20.2mm | 63.4mm |
| V | 11 | 65 | 20.6mm | 64.6mm |
The most common women's ring sizes in Australia are N–P (EU 54–57). Sizing can vary slightly between brands, so check the size details on each product page.
Still not sure?
Our team is happy to help you find the right fit. Contact us or read our FAQs. If something doesn't fit, you're covered by our 30-day returns.
Baume & Mercier celebrates the Chinese New Year, which will begin on Tuesday, February 17, 2026. The Year of the Fire Horse – this year’s zodiac sign – has inspired an exclusive edition of the Clifton collection (Clifton 10839), limited to 100 timepieces, which will become available at the end of November. Symbolizing freedom and energy, a majestic horse appears to gallop along the wide date aperture at 6 o’clock, replacing the even-numbered days. It brings momentum to the Arabic numerals and Chinese characters representing the odd-numbered days. Gold adds a warm glow to the details on the dial and creates a harmonious color contrast, like the flamboyant red that brightens the back of the strap. This elegant, spirited, high-tech watch is equipped with a Baumatic Manufacture movement and a COSC-certified chronometer.
SKU: M0A10839
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