Since if I squint my eyes real hard I can read it as a historical question, Mitchell 300 series. I have a couple Dad had when I was a kid so they're over fifty(!) and still in use. Had them apart a couple times and they are tank-like and simple.
The Shimanos I use mostly are so much better, like night and day. However the oldest has only ten years or so with no problems so only short term testing approval.
