Lincoln Family Album

[RJNorton]

Looks like Mary's writing to me.

I agree with Joe. I am no handwriting expert, and it may not be an exact match, but I think the same person (most likely Mary Lincoln) wrote both. Keep in mind that these were written nearly 20 years apart.

I tried to find a letter in which Mary wrote the words "Robert T. Lincoln." And I found an example in a letter she wrote to Rev. Noyes W. Miner in 1882.

The top image is the handwriting on the back of the photo; the bottom image is the handwriting from her letter to Miner.