Endeavour Perpetual Calendar Concept TantalumAt H. Moser & Cie., the Perpetual Calendar is not a demonstration. Its a given. Legible, intuitive and adjustable both forwards and backwards at any time of day, it has transformed a complication once considered elitist into a common sense horological object. With the Endeavor Perpetual Calendar Concept Tantalum model, the brand has pushed this minimalist approach even further: the same iconic complication, the same mechanical rig our, but this time