What's the big deal you ask? There are at least 3 reasons why this is HUGE:
1. Patek Philippe general only case their exceptionally constructed and finished movements in precious metals. So vintage steel Pateks are inherently rare, regardless of model.
2. The ref. 1518 was the first ever serially produced perpetual calendar chronograph from ANY brand, a true Grand Complications piece, coming in an elegant 35mm package. Less than 300 ref. 1518s were ever produced.
3. Only 4 ref. 1518s are cased in stainless steel. The one on offer has never been seen in the market, until now that is.
No wonder the estimate is expected to be in excess of USD3,000,000. The above picture is the only one we've managed to receive from Philips, stay tuned as we go hands-on with this insanely rare and important Patek later on this year.
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