Lowther PM4 Speakers

I recently moved into a house in Pittsburgh, and found a pair of Lowther PM4 Speakers still in their original crate in my basement. The crate was unopened but the felt/rubber paper had dried out. I am trying to either repair and sell these, or sell them as is. However, I have not had any luck finding anyone who can repair them.

I understand they are very well made, loud, and expensive speakers, but I simply do not know much about this stuff nor do I have any use for them. Can anyone provide some direction on how I can unload these and make a few bucks?

Any input is greatly appreciated