Actually in Canada the formal standard is day first, so 3.12.50 in Canada is 3 December 1950. The American standard is month first. But, seeing as there is zero Xmas dÃ©cor, safe to assume it is in March.
Agreed that the date should be 3 December. But is that the date the photo was taken or the accession date (i.e. when the Archives received or catalogued it)?