Condition: 
The pen is in overall very good condition with a nice even color throughout, there are no cracks or personalization. The barrel and cap have some light surface scratches. The clip is firm and in good condition, with a nice crisp cap jewel ESTERBROOK imprint, as shown. The early model (no copyright symbol) barrel imprint is clear and readable, as shown.  The pen has been cleaned, a new ink sac installed, and water tested.  This lovely pen is ready to write
 
Restoration Work:
The nib and cap have been brushed clean
Nib and feed have been ultrasonically cleaned
A new ink sac has been installed with 100% pure medical grade talcum powder 
The pen has been lightly polished
The pen has been water tested
This pen is ready to write