This 9″ x 12″ book from J. Michael Mehltretter has 230 images over 250 pages, including detailed descriptions and images of dials and hallmarks. This reference focuses on vintage watches, with a strong selection of images to enjoy as well as help understand the value of Patek Philippe as well as for investment. Of course, having said that, we never never never ever buy watches as an investment. Ever. If the watches we own either keep or increase their value while we own them, we simply consider that a bonus to enjoying them on our wrist.