Genuine
The center circle fits well.
The fan at upper right is symetrical.
The dot at center of cross above crown is white and clear.
Forgery A
The center circle appears too large at top and bottom
It deeply touches frame.
The fan at upper right is broken.
The dot at center of cross above crown is color of stamp
Click image for plain view
Bibliography
The Work of Jean De Sperati by the British Philatelic Association 1955
Album Weeds by Rev. R. B. Earee
The Serrane Guide by Fernand Serrane
The Forged Stamps of all Countries by J. Dorn