Hi Norman
I imagine the perspex needs replacing and can’t be polished back to being clear.
In an earlier time I suspect you could have found some reverse-printed Letraset that you could transfer onto the back of a new piece of perspex.
Assuming there’s nothing like that available on ebay you could scan your existing dial and print your own transfer using this wet transfer paper …http://lazertran.com
Seems like a good way to while away a few hours.
Chris
Chris