Bill,
It appears, from reading Phil Sharpe's comments in his book "The Rifle in America", that the rib and sights were made by Sedgley; it was intended to act as a scope mount and sight base combined, similar to the Ruger No. 1 rib. I suspect that the cheekpiece design is by Sharpe, and seems to have been influenced by the Mossberg target rifles then in vogue. The same may be true of the Wundhammer swell...it could very well be Sharpe's design.
Kirk