Thanks for the link karlsson
that does clear it up a lot. You can see the diamond I reported on the left edge of the '208' circle.
The Collinder 268 Circle contains the trapezium and the flat 'V' I saw. So that is the actual Harvard 8 then. When I was at the eyepiece, I noted that these features were "more impressive" than the stuff at the plotted position of the cluster so I figured something was amiss.