Yep, its fitted with a VFD. The spidle housing does have a hole where that knob goes but the top cover is flat and different. Also the etire base cabinet is unlike any photo I could find online.
It's not a 9a. it's bigger in my opinion. I am also bothered by the hole in the front of the head. It has the looks of a Southbend, and the looks of something else.It looks like a 9A. The motor setup is not normal looking. Is it setup with a VFD? Here is a reference photo of what I would expect it to look like.
Cutting oil is my blood.