Not part of the original Futura series by Bauer, Futura Extra Bold was added by Edwin W. Shaar for Intertype in 1952, based to Paul Renner’s design. An oblique followed in 1955, made by Shaar together with Tommy Thompson. [JBJ] Futura Extra Bold Condensed with oblique originated at Intertype, too, see Futura Condensed.
Included in the digital versions by Neufville, URW, Elsner+Flake, Linotype, ParaType, or Bitstream (as Extra Black); with various differences in the details.