Short answer
When someone types "replica drive 42mm blue," they almost always mean a 42mm blue-dial dive watch. The word "drive" is the common misspelling of "dive." If you did mean the Cartier Drive, there is no 42mm blue Drive in the real catalog, so that search term does not line up with an actual reference. The 42mm blue slot belongs to divers: Omega Seamaster 300M, Tudor Pelagos, Breitling Superocean, IWC Aquatimer, and a long list of smaller brands. On a replica site, "42mm blue" is shorthand for that whole family, not one specific model.
That matters because a 42mm blue dial is not a single product. It is a size plus a color, and both of those are where replicas get graded.
Why 42mm sits in an awkward spot
Forty-two millimeters is the middle of the men's dive range. It is one millimeter up from the 41mm Submariner Date and one down from the 43mm and 44mm cases that show up on bigger divers. On paper that sounds harmless. On the wrist, one millimeter changes everything.
- Lug-to-lug length matters more than diameter. A 42mm case with 50mm lugs wears larger than a 44mm case with 48mm lugs.
- Case height decides whether it slides under a cuff. Most 42mm divers run 12.5mm to 14.5mm thick.
- Wrist size is the real filter. Under 6.5 inches, 42mm usually looks oversized on a bracelet.
I look at lug-to-lug first, then thickness, then diameter. Diameter is the number sellers promote and the least useful one.
Blue is the hard part to fake
Black dials hide a lot. Blue does not. The color shifts under different light, and the finish level shows immediately.
- Sunburst blue has fine radial brushing that throws light in a fan pattern. Flat blue is matte or semi-gloss with no ray effect.
- Deep navy and bright royal blue are different colors. Check which one the reference actually uses before comparing.
- Dial printing should be crisp and level. Blurry text, uneven lume plots, and misaligned date windows are the usual tells.
- Bezel insert color should match the dial family. Faded or purple-shifted ceramic is common on cheaper builds.
Movements you will find inside
Most 42mm blue divers use one of four movement families. The budget tier runs a Seiko NH35 clone or a basic 2824 clone. The mid tier uses a decent ETA 2824 or Sellita SW200 clone. The upper tier uses a decorated 3135-style or 8500/8900-style movement with better finishing. Each tier shifts the price, the service options, and how the crown feels when you wind it.
Ask for the movement name, not the marketing label. "Swiss movement" on a listing frequently means a Chinese or Japanese base with a Swiss-made stamp on the rotor.
Case, bezel, and bracelet checks
- Bezel action: 120 clicks, no back play, no grit. A mushy bezel is a cheap bezel.
- Crown threads: should engage smoothly in one or two turns and seal without force.
- End link fit: solid end links should sit flush against the case with no visible gap.
- Polishing: brushed surfaces should be grain-consistent, polished edges clean, no rounding on the lugs.
Water resistance is not what the listing says
A replica marked 300m is not a 300m watch. Gaskets, caseback threading, and crown seals are the parts most often compromised. Treat any replica diver as splash-resistant at best. Do not swim, shower, or dive with one, and get it pressure-tested by a watchmaker if you plan to wear it near water.
What to check before you accept a piece
- Timegrapher reading: rate, amplitude, and beat error.
- Dial alignment at 12 and at the date window.
- Bezel click count and return-to-12 accuracy.
- Crown operation and hand-winding feel.
- Bracelet screw condition and clasp engagement.
- Lume charge and evenness across all plots.
The legal reality
Replicas infringe trademarks, and U.S. Customs and Border Protection can seize counterfeit shipments. Resale is illegal, warranty support does not exist, and a replica will not hold value. That is the tradeoff: you get the look at a fraction of the price, and you accept the legal exposure and the fact that no authorized service center will touch it.