N'ayant jamais su ce qu'étaient les Sweetheart Brooches ...
Sweetheart Brooches were a nickname for the type of badge locket or jewellery that a soldier either made himself or had made by a Jeweller which would be his regimental badge made out of Gold silver etc.
Also what will come into the topic as well will be Battlefield Brooches, which were a soldiers way of getting round the censor
France 1915 all the mail was heavily censored and all a soldier could write home in a letter or photo was I am somewhere in France
but he had a crafty way to get round this.
He would buy a badge of Ypres, Verdun etc and then send that home.
j'aime bien la deuxieme explication : pour ne pas avoir une lettre censuré parce qu'on avait écrit " je suis en Belgique "
les soldats envoyaient des brolitos avec la ville ( surtout pour la Belgique )