Condition! What most people forget is that a cheap watch comes with all the inherited problems of the years of wear and tear. This 16013 is exceptionally well preserved and although the clasp shows some deskdive marks, the rest is extremely good for 40 years. 
 
Details:
 
Brand: Rolex
Model: Datejust
Reference: 16013
Year: 1987
Material: Stainless Steel and 18k 
Dimensions:  36mm
Crystal:  Plexiglass Crystal
Movement: Automatic 3035
Bracelet/Strap: Two Tone 62523H-18 P10 Datecode 1991
Box/Papers: No/No