Has anyone had a Sgian Dubh blade replaced? Who would be the best person for the job?

The blade has been damaged/altered by someone who attempted to sharpen it. I plan on trying to buff out the scratches, but if this fails I thought I might as well replace the blade.

Another question: since this is an antique would it be better to keep the blade that it has (with the damage)? Will replacing the damaged blade with a new one reduce the value of it?

Thanks