Answer first
Inspect the case size and the crown cabochon before anything else. A fake Ballon Bleu 33708 fails on dimensions or on the blue spinel more often than on the dial. Measure the case across the bezel without the crown, confirm the thickness with a caliper, then look at the cabochon under a loupe for a glue line or a flat top. If those three checks pass, move on to the chronograph, the caseback engraving, and the movement.
fake ballon bleu 33708 mens watch
What the reference should measure
- Case diameter: 42 mm across the bezel
- Case thickness: roughly 13 mm including the domed crystal
- Crown: fluted, set with a domed blue spinel, framed by a curved crown guard
- Movement: automatic chronograph, Cartier cal. 8101 MC, built on an ETA 2894-2 base
- Crystal: sapphire, slightly domed, with anti-reflective coating
Prerequisites
- Digital caliper (0.1 mm resolution)
- 10x loupe or a phone macro lens
- Small digital scale
- Soft cloth and good overhead light
- Reference photos of a confirmed genuine 33708 on screen next to you
Step-by-step inspection
- Measure the case diameter at the widest point of the bezel, crown excluded. A reading under 41.5 mm or over 42.5 mm means the case is not the 33708.
- Measure the thickness across the caseback and crystal. Anything near 11 mm is a thin quartz case dressed as a chronograph.
- Weigh the watch head. A steel 42 mm chronograph with a genuine-base movement lands in a narrow band, and a light head usually points to an alloy case or a quartz module.
- Examine the crown. The fluting should be cut, not cast, and the spinel should sit domed and flush with no visible adhesive ring. Run a fingernail over the edge: a lip means the stone was glued in after polishing.
- Check the crown guard. The curve should flow into the case without a step, and the gap around the crown should be even on both sides.
- Study the dial. Guilloché rings should be concentric and cut, printed text should be sharp under the loupe, and the Roman numerals should show no filled or fuzzy edges. Look for the micro-printed signature inside the VII numeral.
- Test the chronograph. Start, stop, and reset the pushers several times. Hands should snap back to zero together. Then watch the small seconds: a smooth sweep means a mechanical movement, a once-per-second tick means quartz.
- Read the caseback. Engraving should be cut with visible depth and clean edges. Check the reference number, the serial, and the placement of the Swiss Made mark against your reference photo.
- Inspect the bracelet or strap fittings. Steel links should alternate brushed and polished surfaces with tight tolerances, and the clasp should carry crisp engraving with screws rather than push pins.
- Listen to the movement. Wind it slowly, tilt it near your ear, and confirm a rotor that turns with a soft whir. A rattle or a free-spinning rotor with no resistance is a warning sign.
- Test the pushers for feel. They should travel with firm resistance and return under spring pressure, not mush through the travel.
- Ask for a pressure test result. A chronograph case with a push-in back or a bad gasket will not hold rated water resistance no matter how good the dial looks.
Red flags
- Case diameter off by more than half a millimeter
- Flat or pale cabochon with a visible glue rim
- Subdials that reset to uneven positions
- Laser-etched caseback with no depth
- Seconds hand that ticks once per second
- Engraved reference number that does not match 33708
- Seller who will not provide a caseback photo or a movement photo
Work through the list in order and stop at the first failure. Dimensions and the cabochon eliminate most bad examples in under two minutes, and the chronograph test settles the rest.