Many people will remember the specialist school photographers, who would visit once a year usually and photograph pupils. I seem to remember it was individual and form photos at junior school (b/w in my day), then the whole year posing outside for a group picture at senior school. Kids would be sent home with a leaflet for parents to choose (and pay for) a print.
I picked this item up as I’m interested in the use of hand colouring on prints prior to the widespread introduction of affordable colour photography. For a time pre-War these ever so slightly hand coloured postcards were one of the options for parents, and I’ve found a number of them from the late Thirties. Here the postcard is additionally set in a paper frame with a calendar attached. As this starts in January, I assume the photos were taken in the winter term to enable parents to get some organised as Christmas gifts for relatives.
As someone pointed out, 1939 turned out to be something of a momentous year and this example must have been stuck in a drawer and never used. The boy in the photo looks like he’d be young enough to not have to join up, one can’t be so sure about his Dad.