For cards of this pattern, only the children's ones, coloured khaki, carried a date of birth (or to be precise a "valid until" date at age 16 after which they had to be exchanged for a blue adult one). So all you can say is that it belonged to someone surnamed Stanley who lived at those addresses which you may or may not be able to tie to the father. Did he ever tell the son it was his? Otherwise, he could have acquired it anyhow at any time and kept it as a souvenir.