It is actually just the rear standard with international back + a lens in barrel + a viewfinder + pistol grip (which seems to be missing in that offer).
Sinar offered 6 Super-Angulons from 47mm to 90mm and one Symmar 100mm. All in focusing barrels.
And 2 Mamiya viewfinders of 47 and 65mm resp. and one Graflex viewfinder with 4 masks.