Takouba with a forte.

[Lee]

It will not surprise me if you discover no break hidden under the reinforcing plates. I have seen such plates on many takouba; the forte is the strongest part of a blade, so breaks there should not be anticipated. Perhaps the intent was as a stiffener, or to change the balance or to lengthen a blade by adding an extension. In any case it is a very nice sword. The mounts are probably mid 20th century and the blade earlier.