It is hard to determine a value of such a vintage LeCoultre Ladies Watch without knowing the Model since LeCoultre made so many watches and Year made would also help. However, if marketed correctly, the watch would like bring $200+ but with the original box in pristine condition, I could see them fetch $300 to $500 on a very good day. I could be wrong but that is my best estimate! Note: An email to LeCoultre with these same pics attached along with one looking directly at the Dial, might help in finding out the Model and Year of manufacture.
Frank