How do you find out the series of the 1928 silver certificate

I assume you are asking about the value, right? Condition is as important as year and we don't know if you bill is well worn or uncirculated. This is just a start for you What is the value of 1928 silver certificate dollar bill You should get it appraised by someone who deals in old money and could maybe make you an offer.

No I am asking how to tell the series be it a,b,c,d or e because there is no number beside the year on the 1923