The short answer
A replica Explorer 16570 buys you the last of the 40mm Explorer IIs, and that is the whole appeal. Fixed steel 24-hour bezel, plain dial, no magnifier over the date, thin case that slides under a cuff. Most factories get the silhouette close and then lose the plot on the bezel engraving and the crown guards. If a seller cannot tell you what the bezel numerals are filled with, or whether the guards were trimmed by hand, the rest of their answers will be just as vague.
Why this reference is hard to copy
Rolex built the 16570 from 1989 to 2011, so it spans two movements, two lume eras and a change in lug drilling. It is a 40mm case, roughly 12.2mm thick, 20mm between the lugs, sapphire crystal, 100m rated, with a date at 3. The 24-hour hand and the engraved bezel do the GMT work. Cheap factories see "Rolex GMT" and reach for parts that belong to a GMT-Master II. That is where the mistakes show up.
Explorer 16570 Fake Rolex Buying Guide: What to Look For
Bezel
This is the single best tell. On the real thing the numerals are cut into the steel and filled with black paint, and the cut has walls. On a budget replica the numbers are stamped or lasered and then painted, so the fill sits on the surface and rubs off within months. Hold it at an angle under a lamp. If the numerals look flat and glossy, and the 24 at the top is not aligned dead centre with the crown, put it down.
Case and crown guards
The 16570 case is slim and the guards are modest, tighter than a Submariner's. Reps overbuild them, and the watch ends up looking swollen on the wrist. Check the lug profile from the side: it should taper, not slab. Early references had drilled lugs, and a lot of 16570s on the used market are drilled. If you want drilled and the seller's photos show solid lugs, you are not looking at the watch they claim.
Crystal, date, dial
No cyclops. The Explorer II never had a magnifier over the date, so any listing photo showing a bubble at 3 o'clock is a straight giveaway. The crystal should sit just proud of the bezel and stay flat across the dial. On the date wheel, look at the font. Cheap reps use a generic disc with a thin, wide numeral. The real font is heavier and more compact, and the window is chamfered, not a raw hole cut in the dial.
Movement tiers, and what they change
- Bottom tier: a 21-jewel Asian movement with a cosmetic GMT hand that does not set independently. The date flips whenever it feels like it.
- Mid tier: ETA 2836-2 with a GMT module. The 24-hour hand jumps in one-hour steps while the local hour hand stays put. That matches how the original caliber 3185 behaves, so it is the more faithful option for an early 16570.
- Top tier: a clone of the 3186, the movement Rolex moved to around 2007. On those, the local hour hand jumps and the 24-hour hand stays fixed. If you are buying a late-spec 16570, this is the one to ask about.
Ask which way the hand sets. It takes ten seconds and it separates sellers who know the reference from sellers reading off a spec sheet.
Dial, hands and lume
Black and Polar white are both common, and the white dial is the harder one to get right. Rep white dials drift grey or cream, and the print goes fuzzy under magnification. Look at the crown at 12 and the five lines of text at 6. They should be crisp with clean serifs. Hands should be the right length, with the GMT hand reaching the chapter ring. Lume colour is a moving target because early 16570s used tritium and later ones used Super-LumiNova, so a cream plot on a 2005 replica is wrong, not vintage.
Bracelet and clasp
Oyster, three links, brushed everywhere except the polished sides of the centre link on later examples. The clasp should close with a firm snap and the coronet on the flip-lock should be stamped cleanly, not raised. Pull the bracelet sideways and watch the end links. Any gap wider than a hairline will rattle, and on Oyster bracelets that rattle is what gives a replica away across a table.
Before you wear it
Assume nothing about water resistance, even when a listing claims 100m. Gaskets on replicas are the cheapest part in the build. Get it pressure tested at a local shop before it goes near a pool, or just treat it as splash-proof and keep it dry. Have the movement regulated on a timegrapher too, since a watch that gains twenty seconds a day stops being fun inside a week.