Looks like mine. Does it have 3 rotating filter stages? Seems the so-called adjustment rod is missing.
One of the rod holders on the side of Production MB was larger than 15mm in diameter. You put an adjustment rod there. It was a two-part rod, one end 15mm (goes into the arm), the other end was larger in diameter (goes into the MB), and the parts are not coaxial but eccentrically mounted. You cold rotate that rod to finely adjust the position of MB so it's horizontal and in line with the lens.
Got the box in today.
Yes, you are correct. I also did not get the arm, but for $60 its a great start! This thing is AWESOME, I love it! Also came with a Tiffen 81EF 6x6 filter, so.. not that I have any reason to use one but, YAY!
I assume (havnt measure yet) that the spacing on the matte box support rod side is 100mm? Seems that way. I wonder how much it would cost to have a another one of those plain 15mm rod mounts made, so I don't have to worry about finding rare parts.
Secondly, any Idea where I might be able to source an arm? I guess I could have one machined, but surely someone makes a 100mm matte box support arm??