Kid,
Interstellarum lists two sources for their OC in their introduction,
Dias, W.S. etc. New Catalog of Optically Visible Open Clusters and Candidates (2012)
Kronberger, M, etc. Galactic Open Cluster Candidates, 2006
While searching this second title I found this article
https://www.aanda.org/articles/aa/pd.../aa4057-05.pdf
It lists several OCs by David Riddle -- which might be shortened to "Rie" -- including Riddle #4. There is a Rie 4 plotted in Interstellarum (along with a Rie 11 & 14). I don't have my atlas with me to check the coordinates, but if Rie #4 is plotted in Interstellarum at the coordinates given in the paper: 02 07 22.7 +60 15 25 -- then Rie = Riddle
As noted in the paper Riddle posted his finds on DeepSky Hunters Yahoo Group.
Edit: Just saw your post, did you have a typo for your coordinates for Rie 4? Cassiopeia is 23h - 3h RA? -- so the paper coordinates look like a match for Riddle = Rie?