The short answer
A replica Drive 42mm in gold is a copy of the Cartier Drive de Cartier, the cushion-shaped dress watch Cartier launched in 2016. The "42mm" in most listings means the large model measured across the case, and "gold" almost always means a gold-toned finish rather than solid 18K gold. Those two words carry more weight than anything else in the listing, so check the case proportions and check what the finish actually is.
What the 42mm number tells you
The Drive case is not a circle and not a square. It is a rounded rectangle with a slight curve down each flank, and the lugs flow out of the case instead of sitting on top of it. Copies get this wrong more than anything else. A good one keeps the lugs flush and the case sides thin. A cheap one looks like a squashed circle. If you can see a hard seam or a gap where the lug meets the case, that answers the question for you.
Size numbers also drift. Cartier's own spec for the large Drive runs slightly under what resellers post, so a millimeter of disagreement is normal. Three or four millimeters is not. That usually means the seller is measuring the outer bezel edge or just rounding up.
Gold finish: plated, wrapped, or honest steel
Solid 18K gold is roughly twice as dense as stainless steel, and you feel that the second you pick the watch up. No coating fakes it. Replicas come in three finishes: thin electroplating that wears through at the crown and lugs within months, PVD coating that is harder and more even but still a coating, and gold-wrapped cases where a thicker layer of gold is bonded over the steel. Wrapped is the best of the three and it costs more. If a listing says 18K gold and the price sits in the low hundreds, it is not.
Movement and case thickness
Cartier's 1904-PS MC is a slim automatic. Copies rarely match it in architecture or finishing. The better ones run a generic automatic, often a Seagull or Miyota base with a decorated rotor. The cheap ones are quartz with a fake rotor glued on. Thickness is the tell. A quartz build usually runs a millimeter or two thicker, which changes how the watch sits under a cuff. Ask for the case thickness and weight. A plated steel 42mm typically lands around 90 to 110 grams.
Dial, hands, and printing
The Drive dial is simple, which is exactly why small errors show. Roman numerals should be crisp and evenly spaced, not fat or smudged. The blued-look hands should be straight and centered over the track. The date window sits at 3 and should have clean inner edges with no pale ring around it. On a gold case the dial is usually a silvered opaline finish. If it arrives chalky or flat gray, that is a step down.
Strap and clasp
Originals come on alligator with a folding clasp. Replicas ship with everything from real alligator to embossed calf. Embossed calf photographs fine and cracks within a season. The clasp matters more than buyers expect. A flimsy deployant will not sit flat, and the watch rotates on the wrist all day. Check that it closes with one firm press and that the tangs line up when shut.
Checklist before you buy
- Case width, lug to lug, and thickness, all three numbers
- Finish type: plated, PVD, or gold wrapped
- Movement type, and whether it is automatic or quartz
- Weight, if the seller will give it
- Crown logo: crisp and aligned, not a blurry smudge
- Return window, and whether the seller honors it
One practical note. US Customs can and does seize counterfeit shipments, and it treats mail orders far less kindly than it treats items carried in by a traveler. That risk is real on any order, and it is part of why some sellers avoid direct US shipping. Budget for it before you commit.