I agree with LauraM, because the Dinner took place in Montreal (after which the couple were filmed on the balcony) and the train picture was taken while they were departing for Ottawa (according to the RC)!

I do wonder which other Tiaras the Queen took with her on the monumental Tour, which included a lot of Banquets, probably more than one in every province I believe, with additional ones on the visit to the US!

She wore the Oriental Circlet at the State Opening of Parliament!



And Queen Mary's Fringe for a Dinner at the Chateau Frontenac in Quebec City, hosted by the Provincial Government!