Short answer

Buy the 1:1 grade Portofino Day Date in the 37 mm case with a Swiss ETA 2836-2 or a top clone of that movement. This build matches the genuine watch at the points people check first: the day and date windows at 3 o'clock, the stepped bezel, the applied markers, and the sweep of the seconds hand. The case measures 37 mm wide and about 9 mm thick, so it wears like the original. Below that grade, the dial printing goes soft, the day disc sits off center, and the case edges lose their polish line.

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Before you order

  • Confirm the case size you want, 37 mm for the original Portofino Day Date proportion or 40 mm if you prefer a larger fit.
  • Ask the seller which movement sits inside. Swiss ETA 2836-2, Sellita SW 240, and Asian 2836 all carry a day and date function.
  • Request the day wheel language. English, German, and Italian discs exist, and some sellers ship one language only.
  • Ask for photos of the actual watch, not the factory catalog image.
  • Check the return window and the warranty on the movement.

How to inspect the watch when it arrives

  1. Wind the crown 30 turns and set the day and date to confirm both discs advance.
  2. Pull the crown to the time-setting position and pass midnight to watch the day and date flip.
  3. Measure the case width and thickness with calipers and compare them to the listed spec.
  4. Hold the dial under a loupe and check the marker edges, the brand text, and the printing of the numerals.
  5. Turn the watch over and inspect the caseback engraving, the reference number, and the serial.
  6. Check the crown for wobble and listen for rotor noise when you shake the watch near your ear.

The options, ranked

1. 1:1 grade, 37 mm, Swiss ETA 2836-2

This is the pick. The case profile, the 42-hour power reserve, and the dial layout line up with the genuine Portofino Day Date. Strap options include alligator grain leather with a signed buckle.

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2. Mid-tier, 40 mm, Asian 2836

A workable second choice for larger wrists. Expect a louder rotor and a day disc that sits a hair high in the window. Price drops by about a third.

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3. Entry grade or quartz

Skip it unless the budget is fixed. Quartz kills the sweep, and the entry automatics use a stamped movement holder that shows through the caseback.

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Flaws common to all replicas

  • The date font runs wider than the genuine print.
  • Day and date windows can sit a fraction off center.
  • Caseback engraving depth varies between batches.
  • Water resistance is rated by the seller, not tested by a lab.

Verdict

Order the 1:1 grade 37 mm with the ETA 2836-2 if you want the closest match to the IWC Portofino Automatic Day Date. Step down to the 40 mm Asian movement build only if you want the larger case or a lower price. In both cases, demand in-hand photos and set the day and date yourself before you accept the watch.