If you searched for a replica Rolex 1666 6, the top pick is a reference-accurate Submariner Date 16610-style build with a 904L stainless steel case, a 40 mm profile, a unidirectional click bezel, and a clone automatic movement. There is no Rolex reference 1666, so the search string is almost always a truncated or mistyped 16610, sometimes with a suffix such as LN or LV attached. The criteria used here are case geometry, bezel action, dial and date printing, bracelet end-link fit, movement behavior, and lume color matching the production era you are copying.

Decoding the number before you buy

Rolex five-digit references cluster tightly, which is why a single wrong digit sends buyers to the wrong watch. The 16610 is the Submariner Date produced from the late 1980s into the 2010s. The 16600 is the Sea-Dweller with a thicker case and a helium escape valve. The 16613 is the two-tone Submariner Date with a gold and steel bracelet. The 16622 is the platinum-dial Yacht-Master. A trailing 6 in a search string is usually a keyword artifact or a partial suffix, not a reference of its own.

Top pick: Submariner Date 16610 style

This is the most reproduced Rolex design in the world, which cuts both ways. Parts are easy to source and the case shape is well understood, but that also means a large gap between budget builds and top-tier ones.

  • Pros: abundant parts, familiar 40 mm proportions, easy to compare against genuine photos, works with a suit or a t-shirt.
  • Pros: many builds use a reliable clone or Swiss-pattern automatic movement with a 28,800 vph sweep.
  • Cons: crown guard shape and lug taper are the two details budget sellers get wrong most often.
  • Cons: cyclops magnification and date font are frequent weak points, so inspect close-up photos.

Choose this if you want one watch that covers daily wear and you care about being able to verify details against public reference photos.

Runner-up: Sea-Dweller 16600 style

The Sea-Dweller is the pick if you prefer a cleaner dial with no cyclops. It shares the Submariner family look but adds case thickness and a valve on the left flank.

  • Pros: no cyclops means one less detail to get wrong, and the matte dial reads well in photos.
  • Pros: thicker case gives more presence on a larger wrist.
  • Cons: fewer accurate replicas exist, so the pool of good builds is smaller.
  • Cons: added thickness makes it sit high under a shirt cuff.

Choose this if you already own a Submariner-style watch and want a second piece with a different silhouette.

Two-tone alternative: Submariner Date 16613 style

Two-tone plating is the hardest finish to fake well. Color match between the gold-tone center links and the bezel insert is the deciding factor.

  • Pros: strong visual impact and a classic 1980s to 1990s look.
  • Cons: plating wear shows faster than steel scratches, and mismatched gold tones are obvious in daylight.

Choose this only if you can see real daylight photos of the exact watch before buying.

Yacht-Master 16622 style

The Yacht-Master uses a platinum-finish dial, a raised bezel with polished numerals, and a softer case profile. It is a niche choice with limited replica supply.

  • Pros: uncommon, so it stands apart from the crowd of Submariner homages.
  • Cons: bezel numeral finishing and dial sheen are hard to reproduce, and selection is thin.

Inspection checklist

  1. Compare crown guard profile and lug taper against reference photos of the exact production year.
  2. Check cyclops magnification, date font, and dial text spacing at high zoom.
  3. Ask about movement type, beat rate, and power reserve in hours.
  4. Confirm bracelet end links sit flush with no visible gap at the lugs.
  5. Check lume color, since vintage-style builds should show aged tone and modern ones should not.
  6. Treat water resistance as cosmetic unless the seller states tested seals, and do not swim with it.

Which one to pick

For most buyers, the 16610-style Submariner is the safe answer because it is the easiest to evaluate and the easiest to live with. Pick the 16600 style if you want a no-cyclops dial, the 16613 style if you want two-tone and can verify the finish, and the 16622 style only if you find a build you can inspect in real photos. Whatever you choose, buy on the details you can verify, not on the reference number in the listing title.