Every Datejust looks just about the same but details matter. Sigma means the markers on the dial are in solid gold, Wide Boy means the hands and markers are wider than usual. Lavender dials are unique to the sunray grey dials and this one is also Lavender in certain angles and light. All of these put together make this watch special, desirable and quite unique on the market. The dial has all its lume plots with the 4 having a bit of luminous mass missing. The case is pitted on the serial but 100% visible.
 
Details:
 
Brand: Rolex
Model: Datejust
Reference: 1603
Year: 1975
Material: Stainless Steel
Dimensions:  36mm
Crystal:  Plexiglass
Movement: Automatic 1570
Bracelet/Strap: Wristwatchme Leather Band
Box/Papers: No/No