Quick Answer
A replica IW371736 stands or falls on four details: the 41 mm case profile, the twin-register dial layout, the blue dial finish, and the strap hardware. Top-tier copies hold the silhouette well, mid-tier copies run a little thick at the caseband and place the subdials slightly small, and budget copies smudge the dial printing. The genuine watch runs an in-house calibre 69355 with a 46-hour power reserve, so no replica movement will match the winding feel or the view through the sapphire caseback. Pick the tier that fits your budget, then run the inspection list below before you accept delivery.
What the Genuine IW371736 Specifies
The reference sits inside the Portugieser Chronograph family, and those family numbers are what replica makers work from.
- Case: stainless steel, 41 mm diameter, roughly 13.1 mm thick
- Movement: calibre 69355, automatic chronograph, 46-hour power reserve
- Dial: twin counters, small seconds at 6 o'clock, chronograph minutes at 12 o'clock
- Crystal: sapphire front and sapphire display back
- Water resistance: 30 m (3 bar)
- Strap: alligator leather with a steel pin buckle
Those figures matter because they give you measurable targets. A caliper and a reference photo will tell you more about a replica in two minutes than any seller description will.
Replica Tiers and What Each One Gets Right
Budget tier
Quartz or basic automatic movement, mineral glass, printed dial. The case is often 1 to 2 mm too thick and the subdials sit too close to the center. Expect the chronograph pushers to feel gritty.
Mid tier
Automatic chronograph movement, sapphire crystal, closer case dimensions. Dial printing is usually clean, but the blue tone tends toward flat navy instead of a sunburst that shifts in light. Strap leather is stiff.
Top tier
Clone or near-clone 69355 architecture, sapphire front and back, correct 41 mm case, sharp applied indices, and a sunburst blue dial. This is the tier where the watch reads correctly on the wrist from arm's length.
What You Need Before You Inspect
- A digital caliper
- A 10x jeweler's loupe
- Two or three photos of the genuine reference at the same angle
- A timegrapher or a timing app
- Bright, indirect daylight
How to Inspect a Replica IW371736 Before You Pay
- Measure the case diameter and thickness with the caliper and compare both numbers to the spec sheet.
- Set the dial under daylight and tilt it through a full arc to confirm the sunburst shifts rather than staying flat.
- Check subdial position with the loupe: 12 o'clock and 6 o'clock should sit on a clean vertical axis.
- Read the dial text at 3x magnification and look for fuzzy edges, uneven kerning, or a wrong font weight.
- Start the chronograph, run it for 60 seconds, and stop it. The minute counter should advance exactly once.
- Reset the chronograph and confirm both hands snap back to zero without drifting.
- Wind the crown through 20 turns and note whether the rotor or winding train feels rough.
- Inspect the caseback engraving and the buckle for shallow stamping or tool marks.
- Time the movement over 24 hours and log the daily rate.
- Flex the strap at the lugs and check for cracking or uneven stitching.
Red Flags
- Seller photos that avoid straight-on dial shots
- Case thickness listed as "about" anything
- Blue dial that looks purple or gray indoors
- Pushers that stick or need force to engage
- Caseback screws or engraving that look cast rather than machined
- Stock photos reused across multiple listings
Wearing and Care
Keep the watch away from steam and hot water, since 30 m of water resistance covers splashes only. Wipe the case with a soft cloth after wear to remove skin oils, and keep leather straps dry. Have any automatic replica serviced every three to four years if you wear it daily, because clone movements use softer alloys and wear faster than the genuine calibre.