The replica IW371788 is sold as a copy of an IWC Portugieser style chronograph, and the specific build you receive matters far more than the model number in the listing. Two watches with the same number can differ by two millimeters of case thickness, one grade of movement, and the sharpness of the dial printing. If you want something that reads correctly on the wrist and survives daily wear, work through the checks below before you pay.
First, pin down the genuine reference you are comparing against. Sellers shuffle Portugieser numbers constantly. Pull up clear photos of the real watch and count the layout: a 30-minute totalizer at 12, small running seconds at 6, a date window at 3, leaf shaped hands, and applied Arabic numerals.
Movement grade drives everything else
Most of these chronographs on the replica market fall into two groups. The cheaper tier runs on an Asian 7750 style automatic with a chronograph module stacked on top. It works, but it is thick, the rotor is audible, and the pushers feel spongy. The higher tier uses a decorated clone with engraved bridges, a closer profile, and smoother pusher engagement.
Test the subdial at 6. On a properly built chronograph copy the running seconds sweep continuously, and the top counter resets cleanly to zero every time. On sloppy builds the layout is partly decorative, the reset lands a hair off center, or the seconds hand stutters.
Dial, hands, and printing
- Applied numerals should sit proud of the dial with clean polished facets, not printed flat.
- Subdial rings should show a fine concentric (snailed) texture under light.
- Logo and text printing should be sharp at arm's length, with even spacing and no bleed.
- Leaf hands should be slim, well finished, and aligned with the markers at 12 and 6.
- The date font and window position are common weak points, so compare them side by side with the genuine photo.
Case, crystal, and caseback
Thickness is the fastest giveaway. The genuine watch sits in the 12 to 13 mm range. Many reps measure 14 mm or more, which changes how it sits under a cuff. If you can, ask for a caliper photo across the caseback and crystal.
Check the crown and pushers for signed detailing and a firm, threaded feel. Look at the sapphire for a faint blue anti reflective tint, then tilt it under a lamp for reflections. On the back, engraving should have depth and crisp edges, and a display caseback should show a decorated movement rather than a bare grey plate.
Strap, clasp, and finishing
Cheap builds ship with stiff embossed leather and a stamped deployant. Better builds use softer leather, even stitching, and a clasp that closes with a solid click. If you are looking at a bracelet version, run a finger along the end links and check that they sit flush against the lugs with no gaps.
A five-minute checklist
- Measure case thickness and compare it to spec.
- Start, stop, and reset the chronograph three times.
- Watch the running seconds at 6 for a full minute.
- Flip the date and confirm it centers in the window.
- Inspect dial printing up close, then again from arm's length.
- Feel the crown, pushers, and clasp for play or grit.
Price tiers and what to expect
Budget listings usually cut corners on the movement, the crystal coating, or the dial finish, and you will spot it within a week. Mid and upper tiers cost more but tend to get the proportions right, which is the whole point of wearing a dressy chronograph. Buy the best build you can afford rather than the cheapest listing with the right number.
One last thing worth saying plainly: these are copies, not the genuine article, and they should never be sold or passed off as real. Buy for your own wrist, keep the receipt, and judge the watch on how it looks and runs rather than on the name printed on the dial.