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

While it looks quasi identical to the third series

This speed companion also boasts a tachymeter scale

Our favourite of the final Audemars Piguet Royal Oak 15202's

Coming direct to us from its original owner and freshly unsealed from a Patek service

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.