AKOS BIRKAS (1941- ), HUNGARIANKOPF 50 (HEAD NO. 50), 1989 (A DIPTYCH FROM THE KOPF SERIES)Two oils on canvas; one with sheet of paper mounted to the verso signed, dated “Fej 50” and inscribed in pen and ink, titled “Kopf 50” in black magic marker to this artist’s pen and ink diagram showing how t