sorry in all the excitement about the rusty blade I failed to point this out (and I now see the pictures were not clear), but the croc kaskara does indeed have a ricasso - can we therefore assume this one is a trade blade?
Attached a better picture
I'm not sure if it will help this discussion but I could start another thread with images of the other pieces than came with these two and Iains takouba (when I have photos of them all). Unfortunately I know nothing more than they all came up for sale in the same auction lot.