Not part of the original Futura series by Bauer, Futura Extra Bold (or Extrabold) was added by Edwin W. Shaar for Intertype in 1952, based on 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.
Various phototype adaptations.
Included in the digital versions by Bauer Types, URW, Elsner+Flake/Scangraphic, Linotype, ParaType, and Bitstream (as Extra Black); with various differences in the details.