I purchased a used Factory Second Innova driver but I have no idea what disc it is. It doesn't appear to say on the disc but its hard to tell because the disc is clear and the writing on it is hard to read. How can I find out? Do the serial numbers tell you anything?

nope :D

Find somebody who has played forever at your local disc golf course. They seem to be able to tell what disc it is.

they should let you compare them in a store.

all the x-outs/factory seconds I've seen from innova have had a 2 letter abbreviation next to the weight to signify which mold it was.