Here are the Pics,
I bought both but already sold the 57 to a neighbor so at least I'll be able to see it from time to time.
I noticed after I got them home that the 36 only has 2 holes at the top for mounting, was this common for that year or Since it doesn't have the usual 8 mounting holes am I correct to assume its a pole sign and not from the Banjo style sign?

Here is the 57,


Here is the 36,


Here are both side by side 36 on the left, 57 on the right.


Pics of the Date stamps,


Always looking for Frontier and Beeline items.