Doc,
telling the Zwickey's appart will need close inspection and some measurements from a caliper. But to give at least a little opinion, all pictured are Zwickey's. The easiest to determin this way are the two with pin holes. Most likely they are 5/16 Eskimos from about 1942 (#1401).
All the rest probably made after 1947, due to the shoulder (trailing edge) being about .40" from the ferrule ends. On the pin hole models this same distance is noticably smaller, right?
The Delta looks like the 1959 model (#1426) to me.
An other thing to look for are the different positions of the ferrule tips in regard to the back end of the tripple laminate - and the width of the later. Difficult to determine ...
I have absolutely no idea about the field point