The Second World War (Volumes I - VI) Winston Churchill

I have the complete set of Winston Churchill's The Second World War (First Edition) . Each one has a signature in the front of the books that I cannot identify. They are in good condition but the dust covers are a bit damaged and they have a bit of mould on the outside of the pages. Each book has been signed but I cannot identify the signature. I understand that they are an international edition. The photos are an example of Edition 1. I would like to know:

The approximate value
If the signature can be identified

Thank you