I have another NOID dendrobium here. I have had this one forever, almost 10 years and it constantly blooms. It had a new growth this spring that died from crown rot (oops) but thankfully I caught it early and saved the rest of my plant. Surprising, this forced it to send out two new flower spikes (yay ). Anyways, if anybody has any guess please let me know. Closest thing I can find is dendrobium burana greenstar.
Unfortunately, as you are likely already aware, any guesses will be just that ... a guess. Your orchid will forever be a NoID. (But one which is a great bloomer for you. )