hey ian, welcome back! kamusta ang pilipinas (how's philippines)?
as far as that item that was sold a couple months ago, i believe it was agreed to be a variation of barong/bangkung type. after i saw the picture while leafing thru cato's book this past weekend, that's when i remember that ebay item that was discussed a couple months ago.
as for the binangon (don't worry fred, i didn't know there was a difference between that and a tenegre til zel pointed it out to me; heck, i'm ilonggo to boot
), i just can't shake the feeling on how the shape of the blade is strikingly similar to the one on cato's book and the ebay item, save for the shandigan blade.