Y PATEK PHILIPPE, REF. 3970EP-019A FINE AND RARE PLATINUM PERPETUAL CALENDAR CHRONOGRAPH WRIST WATCH WITH 24 HOUR AND LEAP YEAR INDICATION, MOONPHASE AND DIAMOND SET DIAL, NO. 4225264, CIRCA 2004 Movement: Cal. 27-70 Q, manual wind chronograph, 24 jewelsCase: Platinum case, screw down display case back, stamped with platinum common control markDial: BlackStrap: Patek Philippe black crocodile strap with platinum deployant claspSize: 36mmSigned: Case, dial, movement, crown, strap, claspAccessories: Patek Philippe box, certificate of origin, instruction book, solid platinum case back, adjustment tool, outer card packagingThe reference 3970 was first released in 1986 as a replacement for the successful 2499. Production of the 3970 ran for eighteen years until 2004. In this time there were three different series of the 3970.The first series had a solid snap on case back with feuille hands and gold baton indexes. The second series came with a solid screw down case back. This came with the designation 3970E. The E is for étanche, which is the French for waterproof.The third and final series had a screw down display case back, as well as an additional solid case back.The example being offered falls into the third series. The certificate of origin is dated Feb 12, 2004, making it one of the last examples sold.