Short answer
A replica Panerai PAM 90 is a copy of the 44mm Luminor Marina Automatic, the base-model Panerai with a black sandwich dial, small seconds at 9 o'clock, and a date at 3. Good copies nail the silhouette. They almost never nail the case thickness, the crown bridge lever, or the movement. If you know those three things going in, you can judge a listing in about two minutes.
The real reference, for comparison
Panerai's PAM 00090 uses a 44mm polished steel case, a crown-protecting bridge with a locking lever, a sapphire crystal, and the OP III automatic movement, which is an ETA 7750 base with the chronograph parts removed. Power reserve lands around 42 hours. Water resistance is rated to 300 meters on paper. Lug width is 24mm, which matters because the strap is half the look. The dial is sandwich construction: a top plate with cutouts, a lume layer underneath. Small seconds sits at 9, date at 3, and there is no cyclops over the date.
What copies get right
- Overall shape at arm's length. 44mm, cushion case, prominent lugs.
- Sandwich dial depth on the better tiers.
- Crown bridge presence. It reads correctly from a few feet away.
- Strap compatibility. Most use 24mm lugs and take standard straps.
Where they usually miss
- Case height. Copies often run 1 to 2mm thicker, and the caseback sits proud.
- Crown lever action. Real levers snap with a firm detent. Copies feel mushy.
- Dial printing. Font weight and spacing on the brand name and model line give it away.
- Date wheel. Wrong font, off-center in the window, or a magnifier that should not be there.
- Small seconds hand length and subdial ring thickness.
- Lume. Charge time and glow color vary between batches.
- Caseback engraving depth and the movement behind it.
Movements you will run into
Most PAM 90 copies use an Asian 7750 derivative with the chrono functions stripped out, sometimes with a rotor engraved to mimic the OP III. A few use a decorated automatic with fake bridges screwed on top. All of them can be regulated by a watchmaker. None match the finishing of the real movement, and the decorated ones are a pain to service because the cosmetic plates come off first.
What I would check before buying
- Ask for a straight-on case profile shot on a flat surface. That exposes thickness.
- Ask for a close-up of the date window and the subdial.
- Ask for the crown lever in the open position, not just closed.
- Ask the diameter and thickness in millimeters. If the seller will not say, move on.
- Ask which movement is inside, by name.
- Get the return window in writing before payment.
Sizing and daily wear
44mm with 24mm lugs wears large. On a 6.5 inch wrist it will overhang. At 7 inches and up it looks correct, which is why the Luminor shape has stayed popular for two decades. The polished bezel picks up scratches fast on any version, real or not, so a desk job is harder on it than the beach is.
Things worth saying out loud
A copy is not the real watch, and treating it as one leads to bad decisions. Resale value is close to zero. Trafficking in counterfeit goods is illegal in the United States, and customs can seize a shipment. If you want the look without the legal and quality gamble, a homage build with a sterile dial or a used cushion-case microbrand gets you most of the way there.