Richard Paine's book noted by Sirius Glass claims the 5x7 Speed Graphic was produced as early as 1912, discontinued by 1926, and reintroduced with slight modifications from about 1932 to 1941. The 4th edition (1942) and 7th edition (1944) of Graphic Graflex Photography by Morgan & Lester mentions it as available with either Graphic or Graflex back, and using 4" square lensboards. The 8th edition of 1947 mentions it in past tense.