I would like a close up pix of the aluminum molder head. I have one that I have assumed was NOT of SS origin.
The 2.5" jointer cutter is of model 10(E/ER) vintage.
As for "Mark 5", that was the model designation up until SS Inc. created the 510. At that time I believe the Mark V 500/505/510 became de rigor.
And as I understand the lineage, there was Magna Engineering, Magna Tool, Yuba Tool, Magna American, Shopsmith Inc., and today RLFBrands.














Yes the jointer is still essentially the same. The design goes all the way back to the Model 10.
I believe the knives will fit all versions of the jointer.(not sure re the latest mod that changed the wedges)
FWIW I also have Mark 2 stuff. No headstock, but the upper parts down to the end castings.