I am pretty sure that is a Yanmar 1200 series tiller. I have a rs1201 that I converted to a 3 point hitch a couple of years ago. typically a 2 point hook up, the rear wheels control the depth. It can also be a pain converting the short PTO shaft to the right spline input. I posted a video highlighting some of the things I did.
Yanmar RS1201 Tiller conversion to 3 point hitch - YouTube
You can get some parts like tines and some seals from a couple of different places:
Yanmar Tractor Parts - Shop Online
Home / News - Fredricks Equipment
Little Miami Trading Company - Compact Tractors
Mine is an absolute workhorse! aside from adapting it to 3 point, I've only changed the gear oil and tightened the tine bolts. Ideally, a new set of tines would be appropriate but, currently it still beats the soil into submission!