Experience the craft of Girard-Perregaux in the 1966 (ref. 49555D11A131-11A), a refined timepiece that blends thoughtful design with reliable performance. A study in proportion and durability: crafted in stainless steel and measuring 40 mm in diameter, with a thickness of 8.9 mm, defined by a round silhouette. The caseback is open, and the crystal is sapphire, delivering water resistance to 3000 meters. The dial composition is deliberate and legible: a silver tone with guilloche finish, framed by mixed hour markers, and feuille hands. Among collectors, it is nicknamed "Silver Opaline". Beneath the caseback lies dependable performance: the GP03300-0030 caliber. Comfort and balance define the wearing experience, making it an easy daily companion. Subtle transitions between textures elevate the overall impression. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.