Speake-Marin "1 in 20" QP Piccadilly Perpetual Calendar - Piece Unique (Pre-Owned)Horology By The Sea is proud to present this Pre Series "1 in 20", a souscription approach Peter used at the time to finance the development and production of the SM2, his very first serially produced 100% in house caliber. Each watch was created to the desires of its commissioner, almost guaranteeing each of the 20 becoming a Piece Unique. Most clients elected for Perpetual Calendar complication, while a few others preferred ordered a Time Only, or