Ref. 16758 Was produced from 1979 to 1988. The present lot bears two reference numbers 16758 on the body of the watch which refers to the specific characteristics of this watch and Ref. 16750 in the case back which refers to the series of references to which it belongs. The case bodies and backs were interchangeable at the factory. A similar watch is illustrated in “Rolex Collecting Modern and Vintage Wristwatches” Vol I by Osvaldo Patrizzi Guido Mondani 2006 Edition p. 385.