I'm not seeing a split serif, but look for the die scratch: Reverse: A die scratch runs SW/NE to the right of the second O of MONTICELLO. http://doubleddie.com/1469003.html
Apologies. With zero (con)text in your post, I wasn't sure what exactly you were asking. I see the split serif on Liberty. There are a few references to DDOs here: http://varietyvista.com/Variety Master Listings/jefferson doubled dies 1942-1943.htm This one has pictures for you to reference and compare: https://www2.briansvarietycoins.com/listings/cat/16
Did you look at that last link I sent you? Because I see split serifs on several of the varieties listed in Brian’s page.
My sincere apologies, I did not. I have Variety Vista and Wexler book marked and will surly add and look at your reference. Thanks.
I checked out Brian's page and added it to my bookmarks as it is very detailed. Upon closer inspection of this coin I discovered a die crack from the dome through the mint mark and B in PLURIBUS to the rim.
Still working on it as I haven't found any of the pick up points for a specific variety; the split serifs on the coin are larger than examples, it is a mixed bag of several. Thanks for the help.
Pick up point on reverse for Brian's DDO-002, there is a die gouge on top of Jefferson's head, but it is on the wrong side of center and angled the wrong way.
Best advice I can give, is to study the coin . Then try to match up the doubling to what the variety site is showing for images, of their doubling . Then take some images of course ..........
Use this site to study your coin . Much more detailed, then the others . http://varietyvista.com/04a JN DD Vol 1/DDOs 1943-S.htm