"Your Rolex" Companion Booklets  ca. 1973 - Onward
Case Serial Numbers Size  Watch Models
ca. 3M onward 1973/'74:            3 1/8" x  4 3/16"   (8 x 10,7 cm)
1975 onward:    4 15/16" x 3 1/2"   (12,5 x 9 cm)
All Watch Models