Hi,
I have a National Graflex with the 75mm Tessar that came with it. Mine is in need of repair, as the shutter curtin does not close all the way, thus overexposing the edge of the film. The lens impressed me when I saw the first results. It is very sharp and snappy. There is also a 140mm f/6.3 that can be used on the II model, but not on the I model. It is a fun/funky camera to use, when working properly. It is suprisingly light for a 2 1/4 slr.
Best of luck.
Peter