Line Perforation 12 On US Postage Stamps After 1914

U.S. line perforation 12 was used on flat plate printed U.S. postage stamps from around 1861 until around 1914. Line perforation 11 was experimentally first used on one U.S. postage stamp in 1915 (#461) and then on many U.S. stamps from 1917 onwards for flat plate printed stamps until 1956 and for Giori printed stamps from 1957 onwards. (A slightly different perforation 11 was used on rotary press printed stamps from 1926 onwards in combination with perforation 10.5) However, perforation 12 did occur on a few U.S. postage stamps after 1914 which are interesting to collect. Which postage stamps are they? Who perforated them? (I am asking about postage stamps perforated 12 and not about revenue stamps perforated 12 since some of the revenue stamps after 1914 are more like 11.75 even though they are listed as 12.)

Scott 909-921 printed and perforated by American Bank Note Company (ABNC).

Scott 1335 printed by Photogravure and Color Company and perforated by American Bank Note Company (ABNC). See: http://arago.si.edu/index.asp?con=1...&tid=2034223

Scott 1355 printed by the Achrovure Division of the Union-Camp Corporation and perforated by American Bank Note company (ABNC). See: http://arago.si.edu/index.asp?con=1...&tid=2034258

Scott 1789 (horizontally perforated 11 and vertically perforated 12) and 1789B (rare: both horizontally and vertically perforated 12). Printed by J.W. Fergusson and Sons and perforated by American Bank Note Company (ABNC).