Short answer
The replica IW371495 is a copy of the IWC Portugieser Chronograph. The genuine watch uses a 40.9 mm stainless steel case, a two register dial with small seconds at 6 o'clock and a 30 minute counter at 12 o'clock, and IWC calibre 79350. Most replicas pair a 7750 derived automatic movement with a case cut to the same 40.9 mm diameter and 20 mm lug width. Case size, dial layout and strap fit come close. The tells sit in the crystal coating, the dial print, the pusher feel and the caseback engraving.
What the IW371495 reference is
IW371495 belongs to the IWC Portugieser Chronograph range, the 3714 family. The line runs a round steel case, a slim bezel, applied Arabic numerals and leaf shaped hands. Dials and straps change between references. The case and the movement do not. IWC lists the dial color and strap option for each reference on its own product page, so check that listing before you compare any replica to photos.
Genuine specs to compare against
- Case: stainless steel, 40.9 mm diameter, about 12.3 mm thick
- Lug width: 20 mm
- Water resistance: 3 bar, or 30 m
- Crystal: sapphire, anti-reflective coating on both sides
- Movement: IWC calibre 79350, automatic, 31 jewels, 28,800 A/h, 44 hour power reserve
- Dial: small seconds at 6, 30 minute chronograph counter at 12, date window
- Strap: alligator leather, or a steel bracelet on bracelet references
What replicas match
- Case diameter and thickness, taken from the same dimensions
- Lug width of 20 mm, so most straps fit
- Subdial positions at 12 and 6, because the movement is a 7750 layout
- Sapphire crystal on mid tier and top tier builds
- Applied numerals and leaf hands on the better dials
Where replicas differ
- Crystal coating. The copy can look flat or purple under store light where the genuine part stays clear.
- Dial print. Compare the stroke weight of the numerals and the IWC Schaffhausen text.
- Subdial rings. Depth and finish vary between factories.
- Pushers. Feel and travel differ from the genuine 79350 setup.
- Caseback engraving. Depth and letter shape are the first thing a watchmaker checks. Sapphire display backs show the movement, and a rough rotor finish is a giveaway.
- Date disc font and the edge of the date window.
Movement inside a copy
Most replicas run an Asian 7750, also sold as the A7750 or Shanghai 7750. It is a clone of the Valjoux 7750 with 28,800 A/h, a chronograph and a power reserve rating near 40 hours. That layout puts a 30 minute counter at 12 and running seconds at 6, which matches the dial of the genuine watch. Lower tiers drop in a quartz module instead. A quartz copy shows a small seconds hand that ticks once per second instead of sweeping.
Checks before you buy
- Ask for the case diameter measured with calipers, not copied from the listing text.
- Ask for a dial photo under direct light to judge the crystal coating.
- Ask for photos of the caseback and the movement.
- Confirm the movement type: automatic 7750 or quartz.
- Confirm lug width and whether a strap ships with the watch.
- Check the return window and the payment method before you send money.
Price range
Automatic 7750 copies of this model sell in the $250 to $650 band. Price tracks the dial, the crystal and the movement finish. Quartz copies sell below $120. Money above that band buys a better dial, better plating and a regulated movement. It does not buy a genuine IWC.
Common questions
Does the copy use the same 40.9 mm case?
Most do, and the number appears in listings. Measure it. A 42 mm case on a 20 mm strap looks wrong next to the genuine watch, and the spacing of the numerals gives it away in a side by side photo.
Will a genuine IWC strap fit?
If the lugs measure 20 mm and the spring bar holes sit in the standard position, yes. Check the hole position. Some copies place them a fraction off and the strap sits proud of the case.
Is a replica waterproof to 3 bar?
Treat any rating as unverified. Copies ship without pressure testing. Keep the watch away from water unless a watchmaker tests the seals and the gaskets.
How close is the dial to the genuine one?
Top tier dials get the layout, the numeral shape and the hand shape right. Print sharpness, the lume color and the finish of the subdial rings separate the tiers. Ask for a macro photo of the 12 o'clock area.