I'm going to say it's definitely a Diplocaulobium (btw, these are sometimes lumped in with Dendrobium and I don't know which genus is more widely accepted, so I'm sticking with Diplo).
This is a somewhat obscure genera that's not super common in cultivation, and I don't think it's heavily hybridized, so you probably do have a species. However, I don't know this group well enough to ID down to the species level, so hopefully someone more knowledgeable can weigh in.
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