Great piece of Camera history, what a camera. In great used condition. Shutter can get stuck occasionally and then frees up so I would suggest it needs a service.
There is a tendency for the name “Speed Graphic” to be used to denote any “press” style camera. The Speed Graphic was manufactured by Graflex, a Rochester, New York based camera producer. It was the dominant portable professional camera from the 1930’s through the end of the 1950’s.
The Speed Graphics and their brethren, the Crown Graphic and Century Graphic are remarkable cameras capable of the highest quality of work. The Speed Graphic has not been manufactured since 1973 and most photographers today are unable to make a direct comparison. In many ways, the Speed Graphic was America’s first and last great camera.