Short answer
There is no Cartier reference called 830107. Cartier Tank references carry a W prefix, for example W5200002 and WSTA0041. 830107 is a stock code used by replica sellers. Accuracy depends on the factory that built the watch. Top tier Tank replicas get the case right and the dial close. They fail on dial printing, the crown cabochon, and the movement.
What Makes a Good Cartier Tank 830107 Replica
What 830107 refers to
The same replica can show different codes on different sites. Codes are listing IDs, not model names. Ask the seller three things: factory name, movement type, and case material. Factory names that appear in Tank listings include AF, K11, BV, and GF. Build quality differs between them by a wide margin.
Where replicas match the genuine watch
- Case size. The genuine Tank Must small is 29.5 mm x 22 mm. The large is 33.7 mm x 25.5 mm. Good replicas land within 0.2 mm.
- Dial layout. Roman numerals, a chemin de fer minute track, and blued sword hands.
- Crystal. Sapphire on mid tier and top tier builds. Mineral glass on cheap ones.
- Case shape. The brancards and the tapered lugs are the hardest part to copy. Modern CNC cases get the outline close.
Where replicas fail
- Dial print. The CARTIER wordmark runs 5 to 10 percent wide on many replicas. Letter spacing on SWISS MADE is uneven.
- Crown cabochon. Genuine Tanks use a blue synthetic spinel with a sharp dome. Most replicas use glass or dyed resin. It reads flat under light.
- Movement. A genuine Tank Must quartz runs the Cartier 057 calibre. Replicas run a generic quartz unit or a Chinese automatic in the mechanical versions.
- Gold models. The Tank Louis Cartier is 18k gold. Replicas use plated brass or steel. Plating wears at the lugs and caseback within a year of daily wear.
- Strap. Real Cartier straps are alligator. Replicas ship with embossed cowhide.
- Caseback engraving. Depth and font weight differ. Serial numbers repeat across units from the same factory.
How to check one in hand
- Measure the case with calipers. Compare against 29.5 x 22 mm or 33.7 x 25.5 mm.
- Use a 10x loupe on the dial. Check the serifs on the C and the R.
- Tilt the crown under a lamp. A glass cabochon shows a hard white highlight. Spinel shows a softer edge.
- Open the caseback. A quartz movement with no maker mark is a generic unit.
- Weigh the watch. A gold Tank Louis Cartier weighs far more than a plated copy. Ask the seller for the number in grams.
Accuracy by price tier
Under $80: mineral glass, printed dial with visible flaws, quartz. Reads fine at arm's length. $150 to $300: sapphire, tighter dial print, better case finish. Above $300: the best copies available. None match a genuine Tank at 10 cm. No replica carries a Cartier warranty or service support.