I have an Ebel watch that is approximately 60 years old. My father brought it back from Switzerland after the 2nd World War. The case and band are made of steel. The band is a chain. The face of the watch is round, black, and the second hand is in a circle at the number 6. It keeps very accurate time, but it needs a little reconditioning. I am trying to determine if it has any value. Can you help me?