" Patek Philippe only made 281 of the Reference 1518 model, most of which came in yellow and pink gold. The company began producing the Reference 1518 in 1941 (during World War II) and the last one was produced in 1954.
Patek Philippe also made an extremely rare stainless steel version (in 1943), of which there are 4 known examples in existence today. “
One was sold at Dr. H. Crott, Mannheim, in November 2004 for SFr. 1,946,240.
photo : Dr. Crott