it's a limited edition, reserved for two markets, two countries. So in short, it's a doubly limited edition! Frédérique Constant has Tourbillon Manufacture qp with a 42 mm polished steel case and automatic skeletonized caliber. Frédérique Constant Tourbillon Manufacture qp A new version of the Frédérique Constant Tourbillon Manufacture qp. This model was created specifically by Frédérique Constant's French management for the French and Belux market (and therefore unobtainable elsewhere in this configuration) and produced in very small quantities: 15 pieces. Offered in polished steel, this qp Tourbillon has a contemporary 42 mm case with a transparent caseback that reveals the fc-975 movement with its circular-grained and côtes de Genève finishes. "Composed of a silicon escapement wheel and anchor, an intelligently weighted balance wheel and a tourbillon cage that has been developed using an industrialized process down to the smallest detail, it ensures a high level of performance and meets the highest quality standards," assures the brand in its press release. Silicon (increasingly used in the high-end watchmaking industry) is designed to improve the tourbillon mechanism by offering optimal friction properties and increased efficiency to meet the caliber's energy requirements. Lightweight, durable, antimagnetic and extremely resistant to temperature variations, this material has made remarkable progress over time in terms of precision. Its friction properties are so good that no lubricant is required.