Might one of these young men be Austin Ernest Albert Smart? Austin wrote a letter on the back to his mother, Mrs Smart of Caversham, on the 23 Sep 1911.
Austin was the son of William Henry Smart & Annie nee Munro, he was born in 1884 in NZ. He married Mary Hammond Wright in 1913 and he died in 1966 aged 82, Mary died the year before aged 74. Mary was the daughter of David Archibald Hutchinson Wright and Alice Mary nee Barnes.
If anyone knows anything about or is connected to the Smart family please do contact me, I would love to hear from you & it may be to your advantage.