Perrelet watch first class open heart a10877 the perrelet first class open heart watch collection captures the essence of the brand by showing off its in house automatic movement through the open heart dial the skeletonised detail is a silent tribute to founder abraham louis perrelets invention in 1777 which cemented the brands passion and enthusiasm for horology within the industry defined by its open heart design that ticks captivatingly in the centre of the black dial this perrelet