One Community is KLOV.
You can find parts there, as well as Ebay. Im unsure of a dedicated Watling Parts Site, but if yours is working,
Youll likely not need any HTF Parts.
As Far as restoration, Purists will appreciate the nice original condition yours is in, executing only a good cleaning on the
outside, and a clean and lube inside. Likely the better choice for "Value" retention.
A full restoration can be done, if you wish. It isnt too hard to restore the cabinet and polish/plate metal and repaint.
If you need any manuals, I likely have several that I was going to throw up on Ebay, that you might like.