I think you could be right, it could be the bottom of Queen Mary's stomacher. QEII wore it frequently in such way in her younger years.
--Previous Message-- : Being Canadian...I should probably know this : but... can some one confirm which brooch HM : wore on June 26, 1959 to open the St. : Lawrence Seaway with Prime Minister : Diefenbaker and President Eisenhower? : : If I had to guess, it looks to be the bottom : of Queen Mary's Stomacher...but somehow that : seems odd to me for a day brooch??? : : The pictures I found are not the best. : : : : : : : : :