Looks like a good call. To verify, I typed O.-J.M. into search engine, and was sent right back to this forum, an earlier thread called "Oncidium Jungle Monarch 'Everglades' AM-HCC/AOS" with a perfect likeness to mine.
It is an accumulation of photos made over the past few years. In most cases, in a botanical garden the tag was missing or not discoverable. At commercial nurseries, often only the genus is printed on the tag.
I'm new to this forum and hope I am not abusing my privileges. Everyone has been very prompt and helpful with their replies.