Double Cuteness

Posted for the Vintage Photos Theme Park theme of "Seeing Double".
My son saw this right after I walked out of the store in Niles, California, and exclaimed, "Oh, that was taken with a Petzval Portrait lens."
He could tell by the way it was blurred in a circle. He is interested in lenses.(!)
This is pre-1920 - but I can't remember the exact date - which was written on the back. I'll have to find this and post later.

Well...many years later I've finally gone back and searched out the date!
Written in faded brown ink on the back: Aug.12th, 1911.