Thanks to all for your replies to this thread.
However, the answer to the original question remains a mystery.
Yes, the standard Wratten series filters are used by many and have had
much written about them. The question is in regard to "Kodak Pictorial Filters".
This is the name on the box and on the filter ring itself. (see images)
One guy is selling them by the case.
Again, from what I've found, no information exists on the internet on these
filters unless I'm just missing it.
Thanks once again!