Short answer: a real IW371468 matches the brand's own reference data down to the dial furniture, and nearly every fake falls over in the same few places. The subdial layout, the applied numerals, the pusher feel, and the case back engraving. If a watch is advertised as authentic at a price nobody in the trade would accept, the reference number in the listing means nothing. I check those four things first, then work outward.
What this reference should look like
IW371468 sits in the Portugieser Chronograph line, and that family has kept the same silhouette for more than twenty years. Steel case around 41mm, thin bezel, domed sapphire with a strong anti-reflective coating, and a dial built on hard symmetry. Two registers, one at 12 and one at 6. Applied Arabic numerals, leaf hands, and a minute track that runs to the very edge of the dial. Most watches in the 3714 group run the calibre 79350, a Valjoux 7750 that the brand reworked and finished in house. So the running seconds moves in small steady pulses and the chronograph resets to zero with a clean snap. Later 3716 references use the in-house 69355 instead, so confirm which calibre belongs to the number you are looking at. The finish standard stays the same.
Dial tells that are hard to fake
Applied numerals are the first thing I look at, and they give away most fakes in under a second. On a genuine dial each numeral is polished on the bevel and brushed on the top face, so it changes character as the light moves. Fakes are usually stamped flat, then glued on with a little too much cement showing at the edges. Check the gap between the numerals and the subdial rings. On a real one the spacing is even all the way around. On a copy one side is tight and the other is loose, because the dial was traced from a scan instead of drawn from the original artwork.
Then the printing. The brand name and city line should be crisp under a loupe, with correct letter spacing and no ink spread. Subdial rings should be thin and sharply defined. Raised or blurry rings are a bad sign. The hands matter just as much. Leaf hands need a proper polished bevel down the center, and cheap ones look grey and lifeless because that bevel is missing or too shallow.
Case, crown, and pushers
Pusher feel is the hardest thing to copy on a budget. On the genuine chronograph the start pusher has a short, light travel with a defined stop, and the reset pusher feels firmer. Mushy, gritty, or long-throw pushers point to a low-grade movement. The crown should carry the fish logo, engraved deep enough that a fingernail catches it. Look at the lug profile too. The lugs on this family taper down and curve toward the wrist, and fakes often keep them too square and too thick.
Thickness is a reliable tell. If the case wears visibly taller than the reference spec, something inside is not what it should be. Usually a thicker movement, or a spacer ring holding a smaller one in place.
Movement and case back
Most of this family comes with a display back, which helps. A genuine 79350 shows proper finishing. Circular graining on the bridges, polished screw heads, the right jewel count, and a rotor engraved with the brand mark and the Probus Scafusia wording. Rotor engraving on a fake is often laser printed rather than cut, so it sits flat with no depth.
The case back itself deserves a close look. Engraving should be centered and even in depth, and the reference number should match what the brand lists for that number. Serial numbers should not repeat across listings you find online, and they should agree between the watch and any papers. A quick search of the serial catches the lazy fakes, the ones where the same number turns up on a dozen listings.
Where fakes fall down, in order
- Subdial size and placement, which follow the base movement and are hard to hide.
- Applied numerals that sit flat instead of catching light.
- Pusher feel, the biggest gap between cheap and decent.
- Dial and rotor printing that looks fine at arm's length and falls apart under a loupe.
- Case thickness, usually half a millimeter to a full millimeter too much.
- Weight and balance on the wrist, which follow the case and the movement.
Cheap fake versus a high-grade replica
These are two different products and it helps to separate them. A budget fake exists to look convincing from a few feet away. A high-grade 1:1 replica is built to the same dimensions with sapphire glass, a working chronograph movement, and dial furniture that holds up in daylight. Neither one is a genuine watch, and any seller who hints otherwise is running a story. The distinction matters for price. When you see an "authentic" IW371468 at a few hundred dollars, you are looking at the first category with a false description attached. Ask for a movement photo, a case back photo, and a dial shot under hard light from the side. Sellers with nothing to hide send all three.
Checklist before money changes hands
- Compare the reference number against the brand's own listing for that number, including case size and calibre.
- Look at the numerals under raking light. Flat means no.
- Press the pushers. Short and crisp is right, mushy is not.
- Search the serial number. Repeats across listings are a red flag.
- Ask for movement photos through the display back.
- Walk away from any price that makes no sense for a genuine example.
Bottom line
The IW371468 is a simple watch to authenticate once you know the four checkpoints. Dial furniture, pusher feel, movement finish, case back engraving. Get those right and most fakes never make it past the first look. Get them wrong and you are paying real money for a story about a reference number.