Nice Tanker, people often confuse wallichii and tankervillea but tankervilleae flowers look downward (nodding) like on your plant rather than looking strait out or slightly upwards on the wallichii. Wallichii also has a larger and longer spur on the labellum and the midlobe of the labellum on wallichii is larger longer and more broad and well defined. I had many plants labelled tankervilleae which turned out to be wallichii but yours is definitely tanker.