The present set was made by upon special order by the father of the present owner and sold to him in the Salons of Patek Philippe Geneva in 1978. This unique set has remained in the same family ever since and is preserved in like new overall condition. It is one of the exceedingly rare complete Joaillerie sets to appear in public.
The necklace, earrings and ring are stamped JPE for Jean-Pierre Ecoffey, a jeweller located in Geneva, specialized in the manufacture of high quality gold bracelets, chains and jewellery, and one of Patek Philippe’s suppliers.
As confirmed by the Extract, one of the hardstones used for this set is chrysocolla, also called gem silica, a bluish green to greenish blue variety of chalcedony that receives its vivid color from the presence of copper. It is the most valuable variety of chalcedony, the best specimens having a pleasing blue color with strong saturation, a uniform translucence, and a lack of inclusions.
Reference 4427, the Jewellery or Joaillerie Ellipse, was in production around 1976 to 1978, made individually piece by piece, each slightly differing from the others, those with important differences with their own reference number, for example 4427-1. The bracelets of the watches and accessories such as earrings, rings and necklaces bear the same decoration, hardstone and diamond settings. At the 1976 Basel Fair a collection of these watches with matching earrings and rings was presented.