If you are planning on selling it may not be cost effective for you to have it restored, you may want to ask a few auction houses
what the difference is in value.
I don't know how the really serious collectors prefer their weights - original with chips they can get fixed themselves or restored.
Larry Selman's site is at http://www.theglassgallery.com/
A weight similar to this but less elaborate sold spring 2008 for $2700 through Selman.
Keep in mind that spring '08 was a financial meltdown ago.