Kodachrome Professional Film Type 5267
Kodachrome Professional was introduced in 1942 to be used as camera material. It was the Kodachrome material that was blown up to 35mm Technicolor dye transfer prints, which was the Technicolor Monopack system.
According to Norris Pope this material was the designation for 35mm Technicolor Monopack. “It was initially intended for backup use in Technicolor three-strip productions and was not sold directly to filmmakers as 35mm Kodachrome (Pope,2016: 87).”
Anonymous (na): The New Kodachrome. Rochester, pp. 56–72, on pp. 60–63, on p. 66 and on p. 70.