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A skeleton watch should never feel like a movement with material removed—it should feel as though the movement was conceived that way from the very beginning.​ ​That philosophy defines the Arnold & Son Nebula.​ Its in-house A&S5201 calibre was developed as a purpose-built skeleton movement, centred around seven radiating bridges that create remarkable symmetry while maintaining exceptional structural integrity. Powered by twin barrels, the movement delivers an impressive 90-hour power reserve, all within an ultra-thin profile. ​ Available in multiple executions—including steel, blue, black and limited-edition gold—the Nebula collection is a study in contemporary architecture, traditional craftsmanship and independent watchmaking.