Yes, a flat field lens that was made for the Polaroid copy camera. This lens will cover (just) 5x4, and works well for very close in work. The Polaroid MP4 came with the Tominon 75mm and 135mm, both are tack sharp.
I doubt the 74mm will cover 4X5. I have the 135 that I use on a Century Graphic. The 135 will cover 4X5. The lens has an unfounded reputation as not a great lens. IDK if I just got a good example, but stopped down a little, it's tack sharp.