A Patek Philippe ref. 1518 — a timepiece already revered as the pinnacle of perpetual calendar chronographs — is poised to captivate the global stage for its astronomically rare case material: stainless steel. This recently unearthed masterpiece, one of only a handful known to exist in steel, crosses the block at Phillips in Association with […] The post A steel Patek Philippe ref. 1518 could break auction records appeared first on The Manual.