Originally made for Camfour, these might be available (now) through other distributors, not sure.
As for value, tough question. There are regional variations on all these, but the biggest driver will be the vintage. This gun was originally made pre-lock, but it has also been made with the lock. The pre-lock guns will carry a higher value due to popularity (or lack of popularity of the lock version).
Gary,
I shot this gun last summer for the first time, and it is quite the shooter!
Didn't put too many rounds through it, some Plus p Plus and full mag rounds, but it was very comfortable.
Had changed the grips to Spegels (of course!), and it was everything I had hoped it to be.