With Patek Philippe Extract from the Archives confirming production of the present watch in 1999 and its subsequent sale on October 3rd of the following year.
Further accompanied by a Patek Philippe Certificate of Origin dated October 20, 2000, wooden presentation box, additional hard back, setting pin, leather envelope, and outer packaging.
Patek Philippe launched the Reference 3970 in 1986 with a solid snap on back. Shortly thereafter, the 3970 with a solid screw back was added and renamed the 3970E (E for étanche or waterproof). The third series of this reference was produced with a screw back and extra sapphire back. The fourth series, of which the present watch is a fine example of, was the same as the third series but with a new serial numbers range.
The reference 3970 is illustrated in Patek Philippe Wristwatches by M. Huber and A. Banbery, Second Edition, Page 305.