There isn't much information out there on these.
Its a three piece razor, with a white bakelite base plate. The base plate has two different blade exposures. (See the insert in the middle image below).

Dorko bought out Emir in the late fourties / early fifties and continued selling these under their name.
Like the Emir or Punktal, the handle is patterned, hexagonal, tapered and hollow.
The handle been hollow makes for a very light and nimble razor.


Dorko Differential Dorko Differential Dorko Differential
How does it shave?
I have only used it once and if the first use is anything to go be, it turned out to be a mild yet effecient razor.
Dorko Differential SOTD