Introduced at Baselworld 2016, the Frédérique Constant Slimline Perpetual Calendar Manufacture was one of the highlights of the convention, thanks largely to its slim design, in-house perpetual calendar movement, and most amazingly, a price of around 8,000 CHF. Where Frédérique Constant tried to do better was with the base movement and the price: unlike the Montblanc,…