I have recently aquired 2 Speed Graphics from my step mom.Her 1st husband was a professional photographer in the late 40's to late 60's. One camera is a 4x5 Speed Graphic which uses cut film holders and is the standard grey color. The other is a smaller camera and has roll film backs of 2 1/4 x 3 1/4 and also 2 1/4 x 3 3/4. The smaller one has red bellows and a black & silver finish outside. Can anyone give me some tips on idenifying these 2 beautiful old cameras?

Try this link
http://graflex.org/speed-graphic/graphic-models.html

click on the blue links for photographs of the different models, then come back here if you have further questions.