Lincoln's birthday

[Gene C]

One place to start would be comparing the handwriting in the Bible to other early examples we have of Lincoln's handwriting.
I don't know if it's possible to determine when the entries were made, or even if by the same hand. Do we only have Herndon's account that it was written in Lincoln's hand around 1851? Some entries could have been by another family member, his step mother, cousin, step-sisters, or even a neighbor.

It would be interesting to see the original or copy of the original Bible.
That should not diminish the accuracy of the records (which Herndon transcribed). Anyone know where the Bible is now?