Gents Frederique Constant Slimline stainless steel watch with a round silver tone dial with roman numerals, a second hand sub dial and date window on a black leather strap. Case 39mm. This watch is powered by a Swiss quartz movement and has a sapphire crystal glass. he Frederique Constant Slimline Range consists of some of the evergreens in our collection. These timepieces include latest technology, while maintaining their same successful, stylish and clean designs. The Frederique Constant Slimline: a tribute to fine Geneva Watchmaking, uniting style, elegance and high quality at sensible prices.