1938 Proof Jefferson Nickel, FS-401 Confusing

I have a 1938 Jefferson Proof that I have been looking over and I believe it is the 401 variety. in the variety section of Coin Facts, it shows that the RED FS-401 has an added serif at the bottom of the “S” in trust and a strengthened hair bow.
However, looking over other proof images, some of these have the same serif marks( Could it be that these are just unattributed?) I’m just confused and and would like a few more details if someone knows Jefferson nickel varieties
Here is the coin I have, sorry for the crummy pics
I did look for older threads, but they were so old and the pictures are not available
3
Comments
Here is an article about the reengraving you are seeing on your coin.
https://numismaticnews.net/us-coins/re-engraving-a-mystery
There are 5 varieties - it looks like you have FS-401
varietyvista.com/04a%20JN%20DD%20Vol%201/REDs%201938.htm
Thank you! there was another article attached to the link, the author who posts here said there is the extra serif and a “worm like” design running up the “S” which this coin has. I feel pretty confident this is the FS401.
Although I am not an expert on Jefferson nickels, I would say your coin does look like the FS401....Cheers, RickO
That would be me, and yes it is.