1964 Kennedy Half Dollars

Nice lot of Kennedys. Make me more serious about starting a Dansco 8166

I tried to get one - sold out everywhere I looked. I did get the 2nd Kennedy album 8167 from "2012 to date" to bide the time untill the 8166's get back in stock.

I checked out Variety Vista from Earle42's post. The site is amazing! However, I am at a lose when it comes to understanding the numbering system. For instance I see 1964 DDO-002
PR-2-O-V-CCW FS-101. I know the DDO stands for double die and PR is proof but what is the rest telling me?

Another one is labeled 1964 DDO-035 PR-35-O-II-C and leaves more confused lol. I found a key but the key lacks quite a bit of the abbreviations being used and doesn't seem to stick with the same ordering.