Perpetual Calendar Chronograph. One of the best parts of the patek philippe 5270p perpetual calendar chronograph is a caseback spectacle. A perpetual calendar chronograph combines two complex complications in one, taking great detail and expertise.

One of the best parts of the patek philippe 5270p perpetual calendar chronograph is a caseback spectacle. 1518 retailed for $1,500 in 1946 whereas the more standard chronograph ref.