Patek Philippe 1518. Inside the 35 millimeter watch is a valjoux based caliber. The manufacturer even invented the first so called solid state quartz watch with no moving parts and had it patented in 1959.
The result was the calibre 13 130q. The production of the patek philippe ref. Reference 1518 is the rarest patek philippe reference with only 281 pieces produced from 1941 to the 1954.
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All of this was put together on the eve of the watch coming up for auction at phillips in geneva where it would go. Inside the 35 millimeter watch is a valjoux based caliber. In fact the 1518 and 2499 which used the very same caliber were the only perpetual calendars with chronograph for the better part of half a century. Fresh to the auction market the incredible stainless steel.