help with an unknown character

[Elbrecht]

Hi - 

any help with an unknown character - very appreciated: 

                        elbrecht.com/SW.png   [400KB]

On title of a 1932/33 book on the "Principle of Contradiction" - 
a mathematical/logical character in use for book printing???

Thanks
Elbrecht

#  #  #

›The fact that you know,
  is proof that you don't.‹