TGIF —thank God it’s Friday. The A. Lange & Söhne 1815 Rattrapante Perpetual Calendar is without a doubt a masterpiece of horology and one of our favorite watches out there. This watch unveiled in 2013 received two prizes the same year at the Grand Prix d'Horlogerie de Genève — the Grande Complication Prize and the Public Prize. Available in Platinum or Pink Gold this watch is stunning in either metal. Fitted with a case measuring 41.9 mm in diameter —not 42 mm as German engineering calls for the utmost precision—, the craftsmanship is just out of this world.