The closest you'll ever be able to get is 'hybrid Formosae-type Dendrobium'... Pretty one, though, looks like it could have tobaense somewhere in its ancestry. Nicely grown and bloomed, too!
I'd say the best way to find out the exact ID, is to contact the vendor, from whom you bought it. If it had the tag or a name at the time of the purchase, I"m sure the vendor will help you remember it