I would not hesitate to label this Cattleya (Laelia) purpurata. The petal stripes might make it forma striata, or maybe f. flammea or f. venosa. You'd have to find a Brazilian expert to get an opinion on that. There is a slight chance it is a hybrid, but I think it would have to be 3/4 or more C. purpurata or involve a closely related type like C. crispa or C. lobata. Given how common and popular it is the pure species is more likely unless you remember having that kind of hybrid.