Originally Posted by OurWorkbench

I think that since it has the cams, it would be a Gritzner model HZ. This would be according to https://www.naehmaschinenverzeichnis...inen/gritzner/

As far as the sound of the machine, motor or controller while slow vs fast, I'm unsure where to look or what to do. I'm guessing it is a resistor type controller and those can have kind of a grinding sound. Have you tried taking the belt off and trying to run the motor? Does it sound the same or different?

Janey - Neat people never make the exciting discoveries I do.
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