I had to prepare the funeral of my father in law and found this beautiful picture of a school trip to Schiphol in his photo album.
I would like to detail the date a bit more.
PH-CGB Jan Scorel was registered with the KLM from 1954 till 1964.
My father in law was born 1948 and was probably still in the boys school. as there are only boys in this picture.
That would limit the photo till pre 1960.
I have read that the PH-CGB was converted from Convaie 340 to Convair 440 spec. I do not know the date of that conversion nor do i know if you can see the difference.
The painted hangar must have been quite colourful and has "737" mentioned so might also give a clue?