I think the brooch you are looking for is the brooch that the present Queen now wears every year at the Trooping of the Colour. It is a large oval regimental brooch showing the emblem of each of the 5 guards regiments with a crown at the top of it. I have seen a photo of Queen Mary wearing it on her coat at the 1950 Trooping ceremony on the balcony.
--Previous Message-- : Earlier this evening, I was browsing through : one "Diamond Jubilee" : commemorative "book" (the new one : out on sale at a bookstore) in which it has : a lot of pictures. I did not buy that one, : though.....just browsing thru it. : : Anyway, I have a couple of questions for : you, Nellie. There are two separate pictures : of Queen Mary (with two little princesses : and one or both of their parents) at the : Trooping of the Color parades in 1931 (shown : in a carriage, I think) and 1935 (on the : palace balcony). Both pictures show Queen : Mary wearing her hat [not sure if it's the : same hat at both times or different : hats....those were black and white photos) : but she had this brooch on the front side of : her hat in both photos and this was the same : brooch both times.....I looked at it closely : and it looked like a "Prince of Wales : feathers" with the crown at the top of : it. Also, I noticed that one of those photos : showed the Duchess of York (as the Queen : Mother was then) having had a diamond brooch : on the front of her hat, too, but it's not : too distinctive enough for me to describe it : to you right now. Do you have such pictures : you could post here for me to see?? If you : do, please, please?? Thanks! I am putting : these questions for you since you are the : most devoted Queen Mary fan here. :