My mill looks pretty much the same. Mine is a cast iron base.
I guess the Rusnok (SP) vertical mill is adapted?
I'll have to take some pics.
As I said, the horizontal part is not together though.
The drive for the horizontal part is partially inside big 220 volt motor in the base,varible speed (pulley V-grove, gets wider or smaller to increase or decrease speed,same as your's I believe. Here are some pics, sorry for the mess & not so good pics
Any pics form the drive system would be cool to see as mine was apart when I got it. Thanks