Schwinn crank ID

[largek9]

I'm going thru some old cranks I have and trying to date them ,here is just a few examples:
SA19-63 is that 1963 ?
SA1-63 ? is there a code for any types of bike?
SA10-61 came off 74 speedster?
AS&Co? old but time frame or ?
Just a few to get me started so I can figure out the code.thanksTom.

 

[Xcruiser]

Heres my take from tearing down a hundred schwinns,if you have a crank marked 61 out of a 74 bike,its been replaced.
Usually on the early AS&Co cranks the year is tiny and on the opposite side.
But yes bro 63 is 1963 etc etc.