Alvin, Steve, Jimi,

thanks for the response. The details in the sketch were drawn a little bit brighter than in the eyepiece to show what was been seen. The first impression in the eyepiece showed a faint round glow. With averted vision the ring could be detected as better defined edges completely around the glow. I noticed, that the brightest part of the ring was to the S, following knots to the E and W. The N side was the faintest edge part.
The faintest companion which I could pick up was PGC 3441759, 35" NE of the ring.

A second ring this night was UGC5936 but not so fascinating like the VV 788 ring.

Jimi, what impression of IC 298 (Arp 147) do you have in comparison with VV 788? Is the ring much more difficult? With 27" I did not observed it yet but will give it a try.