This a bifoliate Cattleya (that I earned some years ago in bad conditions) blooming at same time of Cattleya Portia.
The flowers are bigger than C. Portia ones, the general aspect and buds (showed in another division) are similar (the yellow spots in the leaves are mancozeb).
May be C. skinneri, C. bowringiana or - much more probably - a related hybrid (C. Fabia, C. Fabiata....).
Some one guess?