Accompanied by Patek Philippe Certificate of Origin and Warranty and Extract from the Archives confirming production of the present watch with opal case and rose-cut diamond-set bezel in 1895 and its subsequent sale on 31 May 1904. Furthermore delivered with the original fitted presentation box containing a spare crystal.
It is thought that the present watch with its 7 lignes movement is one of the smallest watches with a keyless lever movement ever made by Patek Philippe.
The company's smallest but keywound watch with a diameter of only 9.023 mm. or 4 lignes movement was exhibited at the London World Exhibition in 1851 (see Patek Philippe Pocketwatches by M. Huber & A. Banbery, p. 106, pl. 13). The second smallest example features a keyless 5 lignes cylinder movement manufactured in 1893 and numbered 97'332.
The possibly third smallest example with a keyless 6 lignes lever movement no. 97'364, manufactured in 1893, was sold in this sale room on 18 May 2004 for SFr. 59,750 (lot 87).
Another particularity of the present watch is its case, cut of an opal and hollowed in order to fit the movement. Most opal is more than 60 million years old and generally dates back to the Cretaceous period when dinosaurs roamed the earth. Its most striking quality is its ability to refract and reflect specific wavelengths of light, the phenomenon described by the term "opalescence". The interplay of these pure wavelengths of light gives opal its unique visual appeal, and makes it one of the most sought-after gemstones in the world.