It's possible that the wife won't know the approximate pre-owned value, nor would she now how to liquidate them for the best value.
If you are interested in the watches, perhaps you could offer her a sum that she would accept (let her come up with the price). Maybe you can pick them all up for $25k and also take them off her hands.
I had a relative do something similar. She was executor to an estate and there was a huge coin collection. She didn't know what to do with it and she wasn't about to have a thousands of coins individually appraised. She doesn't even know how to contact a professional coin appraiser. So she ended up selling it to a collector for pennies on the dollar (no pun intended) just to get rid of them.