PATEK PHILIPPE - 3970EP rare, very fine and elegant platinum, perpetual calendar, chronograph wristwatch with moon phase. [..]
The famous Patek Philippe ref.3970 wristwatch was produced from 1986 to 2004.
The peculiarity of the 3970EP version (where the E means waterproof) resides in the closed caseback that before was under pressure now becomes a screw.
This one in particular has a rare black dial with white gold indexes and a double closed and visible case-back.