yup, michael, in the words of the immortal Crocodylus Dundee
That's not a flyssa, THIS is a flyssa
the distinctive zoomorphic brass covered wood grip and brass inlaid and engraved blades are diagnostic. they do seem to come in variable lengths. i even have a curved one.
there are a few SE Asian blades of very much the same shape but with different grips....like the kalasan
still, yours looks like a nice blade, must post better photos when you get it.