The Kodak Vigilant Six-20 medium format camera was manufactured from 1939 to 1949 and originally sold for US $38.00 (about US $670 in 2019). The Vigilant cameras came with one of at least four types of Kodak lenses. Three were Kodak Anastigmats (later called Anastons): the F/4.5 105mm, F/6.3 105mm and F/8.8 100mm. The top of the line Vigilant came with the excellent f/4.5-32 101mm Anastigmat Special (later called Anastar) lens in a Kodak Supermatic shutter with speeds of 1 to 1/400 second plus B&T. There are also several shutter types including the Dakon, Diomatic, Kodamatic, and Supermatic. The Vigilant series shared a common body with the Kodak Monitor series. The main difference was that the Vigilants had a simplified top and completely manual film advance; you needed to watch the small red window in the back of the camera to make sure that you didn't advance past the next number else you risked overlapping exposures or losing a picture. The Vigilant's top plate contained the shutter release, a reverse Galilean viewfinder, the folding bed release, and the film advance knob. Cameras equipped with f/4.5 lenses also had a parallax adjustment on the viewfinder. An old style waist-level reflex viewfinder was located on the lens mount. Most of this information was gleaned from Wikipedia and the Matt Denton site link above.