It's a Sicma 122 cm rototiller. I just used it for the first time - oh my gawd. I tilled the whole early spring patch in less time that it would have taken to get the old TroyBilt started.
The Sicma works perfectly with my Kubota 2320, the paint even matches!
The old TroyBilt is a hand-me-down from my dad. It is a great machine, but it's been through 41 seasons and it's due for a rebuild. Maybe next winter.