The Calatrava is Patek Philippe's plainest argument: a round case, a clean dial, and nothing to hide behind. This reference is 39mm in white gold with a date and an opaline rose dial — the tone collectors call salmon, harder to execute consistently than it appears, since the finish shifts with the light and any inconsistency in the surface shows at once. What matters on examination: dial condition above all, because a salmon-toned opaline surface cannot be restored without becoming a different dial; then case geometry and lug sharpness, which a plain case has no ornament to disguise. Confirmed through the desk. Maker: Patek Philippe. Reference: 5227G-015. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.