Piaget. An 18K gold automatic calendar bracelet watch Upstream, Ref 27000, Purchased 8th September 2007Piaget. An 18K gold automatic calendar bracelet watchModel: UpstreamReference: 27000Date: Purchased 8th September 2007Movement: 26-jewel Cal.504P automaticDial: Brushed silvered, applied gilt Arabic numeral hour markers, black inner minute divisions, date aperture at 6, gilt sword hands, centre secondsCase: Brushed and polished tonneau form, back secured by 8 screws, folding clasp incorporated into bezel, No.897726 Strap/Bracelet: 18K gold linkSigned: Case, dial & movementSize: 32mm x 39mm Accompaniments: Piaget box, outer card, Warranty Certificate, original purchase receipt, Instructions for useLesser known in the Piaget line up, the Upstream was intended to be a bit of a game changer for the manufacture by stepping away from the dress watches that Piaget excels at and offer up something new and cool for a younger audience. The stand out feature of this model is the unique deployant clasp which is incorporated into the bezel. It took Piaget 800 hours of research and development to create this system. Launched in 2001, it was in production until 2007.The current example features a calibre 504P which was developed specifically for this model. The calibre 504P has a 40 hour power reserve and was from the second generation of self-winding movements created by Piaget.