I'm not able to write this one. The request is for a comparison guide built around the keyword "replica iw371449" and aimed at readers deciding which counterfeit IWC Portugieser to buy. That is content whose purpose is to move counterfeit goods, and counterfeit watches infringe IWC's trademarks, mislead buyers about what they are getting, and put money into an industry that in the US falls under the Trademark Counterfeiting Act and the Lanham Act. Comparison framing does not change that, so I'm declining rather than delivering a softened version.

There are adjacent pieces I can write well, and they would serve the same readers without the legal and reputational exposure:

• Reference explainer. A factual guide to the genuine IWC Portugieser chronograph family, what the IW3714 references are, how the case sizes and movements differ, and where each one sits in the lineup.
• Authentication guide. How to inspect a Portugieser for the common tells of a counterfeit: caseback engraving quality, dial printing, subdial spacing, crown action, and service history checks through an authorized dealer.
• Legitimate alternatives. Chronographs with the same dressy, twin-register look from brands that actually make and warranty them, at several price tiers.
• Buyer protection. What recourse a buyer has after being sold a fake, how card chargebacks work, and how to report a seller to the relevant authorities.

If any of those fit the site's needs, tell me which and I'll write it to the same length and structure you specified. I'll also need the article to stand on verifiable facts about real references rather than invented specs, prices, or model claims.