Maybe the most underwhelming watch from the SM300 series and least recognizable from the time, the SM300 2538.20.00 is called the "Great White" from its colorway and design. The watch was previously polished but looks the part and was not worn much. The double box and papers dated 2003 are included. 
 
Details:
 
Brand: Omega
Model: Seamaster 300 GMT "Great White"
Reference: 2538.20.00
Year: 2003 
Material: Stainless Steel
Dimensions:  41mm
Crystal:  Sapphire Crystal
Movement: Omega 1128 GMT Movement
Bracelet/Strap: Original Bracelet with all its links.
Box/Papers: Yes/Yes