Definitely part of the Oncidium alliance, I would guess either an Oncidium of the section Heterantha or some sort of Erycina/Psygmorchis. Having said all that, none of the former Psygmorchis species (now lumped into erycina) have pronounced pseudobulbs like seen here (as far as I know, I could be mistaken) and I couldn't find any of the "original" Erycina species that matched. Unfortunately the taxonomic mayhem of the Oncidiinae makes it hard to look things up for identification.
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