First one is in excellent condition with an adaptall 2 back cap.
The second one works fine but is in less than perfect condition and has no caps.
The defects are:
a) A small black plastic tab on the side is broken (see pic)
b) There is a small gap between the lens mount and the flange on one side (see pic)
First one with rear cap 
Second one 
Second one - showing missing tab 
Second one - showing the gap 