What the 33671 number means
Cartier stamps a case code on the back of each watch. 33671 is the case code for the Ballon Bleu de Cartier in a 42 mm steel case with an automatic movement. The retail reference for that model on a steel bracelet is W69012Z4. The case code and the reference number are two different marks. A genuine watch carries both, plus a serial number unique to that unit.
Because 33671 marks a popular size in a steel case, it is one of the most copied Cartier models. Replicas run from quartz movements in plated cases to automatic movements in 316L steel cases that copy the outside shape. The checks below apply to all tiers. The mid and high tiers need the closest look.
Genuine specs to compare against
- Case: 42 mm steel, about 13 mm thick, 30 m water resistance.
- Movement: Cartier caliber 049, automatic, 21 jewels, 28,800 vph, about 42 hours of power reserve. Caliber 049 uses an ETA 2892-A2 base.
- Crystal: sapphire on the front. Caseback type varies by reference and production year. Confirm the exact reference before you compare.
- Crown: fluted steel crown at 3 o'clock with a blue synthetic spinel cabochon, set inside a steel guard that presses into the bezel.
- Dial: silvered opaline finish, flinque guilloche center, printed Roman numerals, blued steel sword hands.
Tells on the case and crown
- Cabochon. Genuine is a domed synthetic spinel, deep blue, smooth polish, no visible glue. Fakes use plastic, glass, or dyed stone. Look for a cloudy body, a flat top, or a ring of adhesive at the base.
- Crown guard. On a genuine watch the guard is part of the case and meets the bezel curve at 3 o'clock with no seam. Fakes show a step, a gap, or a rougher polish at that joint.
- Caseback engraving. Genuine text is cut with depth and clean edges. Fakes are laser marked, which reads shallow and gray. Compare the Cartier script and the shape of the 33671 digits.
- Serial numbers. Replicas reuse one serial across many units. Search any number you are given and see if it shows up on more than one watch.
Tells on the dial
- Guilloche. The center pattern is stamped in fine rings. Copies show shallow rings that fade in the middle.
- Numerals. Genuine Roman numerals have crisp edges and even ink. Check the VII and the X. Copies show thicker strokes and soft corners. Cartier micro-prints Cartier inside a numeral on some references. This varies by reference, so confirm it for the exact model before you trust it.
- Hands. Genuine sword hands are blued steel with polished bevels. Copies use painted steel. The color reads purple or flat navy under light.
Tells on the movement
If the watch has a display back, look at the rotor and the bridges. Caliber 049 carries Geneva stripes on the rotor, perlage on the base, and blued screws. Many replicas use a Miyota 9015 or a Seagull ST2130 with no decoration, or a stamped plate that hides the real movement. A quartz tick in one-second steps is a fake. A smooth sweep at 8 beats per second matches the genuine rate.
What to check before you buy
- Weigh the watch. A 42 mm steel Ballon Bleu on a bracelet sits near 130 to 160 grams. A light watch at the same size points to a hollow case or plated alloy.
- Ask for a photo of the caseback with the serial in focus.
- Ask for a timegrapher photo. The genuine rate is 28,800 vph.
- Check the price. A steel 42 mm Ballon Bleu trades in the low thousands used. A new-in-box offer far under that is not a genuine watch.
No single tell proves a watch is fake. Three or more together do.