Orchid Board Mystery Plant of the Day Contest

[Keysguy]

I've had this plant for at least 10 years. I'm pretty sure it was acquired as a raffle table special. As I was getting ready to depart FL for the summer, I noticed it was starting to put up a spike. Never having actually seen it in flower, I threw it into the car and brought it north to see if I could bloom it out. It is tagged as Prosthechia fragrans. I have serious doubts and those doubts have nothing to do with whether it is Prosthechia or Anacheilium.

The flowers are wrong and the plant is wrong for fragrans. And to boot, it is barely "fragrans" at all.

This is likely a relative and a hybrid. Distinguishing features are the resupinate flowers and the plant has large pseudobulbs that are quite unique. They are roughly up to 2" in circumference and are plump on the front and back but they are "flattened" in a way that gives them a definite sharp edge all the way around. Sort of like a big fat coin.

I've tried to capture some of this in pictures.

Anyone have any ideas?