Perpetual Calendar Chronograph in Yellow Gold 'Fourth Series' EX080123 The display is cleaner than

The display is cleaner than that of the simpler Dato-Perpetual

this white gold Daytona with the highly sought after ‘Ghost’ dial ticks all a collector’s boxes

This speed companion also boasts a tachymeter scale

While it looks quasi identical to the third series

This example from 2010

Perpetual Calendar Chronograph in Yellow Gold 'Fourth Series' EX080123 The display is cleaner thanIntroduced by Patek Philippe in 1986, the Reference 3970 holds a legendary position as the brand's third serially produced perpetual calendar chronograph, following the iconic 1518 and 2499. As a transitional masterpiece, the 3970 perfectly bridged the gap between vintage charm and modern reliability, making it a cornerstone for any serious watch collection. This 18K yellow gold (3970EJ) example dates to 2001 and belongs to the coveted Fourth Series.