That's the early 0000 400 1300 coil that came with the outboard trigger module. Those came on 038s a lot as well. They were used on the earliest 064s.
Case is done.View attachment 91734 View attachment 91735 Looks to have had some machine work done to the case. You can see the insert is flush on top,but will hang a nail at the bottom.On the outside,that's like a shim.The saw had a smoked lower rod bearing.Not sure I want to use the case.The insert spins.
Great question— hard use? Predominantly pro use? Alloy problems?Why does this seem so common in 064s?