Vintage Photograph Young Lady Staring at Flower Cannot Confirm If It's Original

I am not sure if this is an original. I got this in an estate collection of ephemera and to me the backside of the photo paper looks too white to be from 1920s or before..Also the left edge shows a border whereas the right does not. It was mounted though as you can see from photos so if it is that may have protected paper from tanning. Regardless, I cannot confirm age of photograph. Front does show visible wear and imperfections. 

Dimensions are approx 5" x 4".