Patek Philippe skeletonized pocket watch ref. 894
The first skeletonized Patek Philippe watches appeared in the late 1860s. However, it was not until 1978, with the dawn of the ref. 894, that Patek Philippe started regular production of the skeletonized watch.
The decorated caliber 17-170 of this watch is made out of 14k gold (for strength) and features a hand-engraved Patek Philippe signature and movement number. Every possible part of the gold bridges is fully engraved by hand.
The 18k case holds the structure in place and only the setting mechanism, mainspring, and parts of the escapement are made of steel. The mastery of the art of engraving is shown in full force within these miniature works of art. It was not until 2006 that this watch was quietly discontinued.