Young Marathi Boy's Thread Ceremony (Upanayana) - c1920's

I received this photograph from Mr. Christopher Graffius ( christopher.graffius@yahoo.co.uk ) with the following note:

This Photograph is from the other side of my Indian family, the Chitnis family of Maharastra. They are Brahmins and I believe that the photo is of the young boy's thread ceremony. He is my great uncle. I believe the photo dates to around 1920.