Alan, documentary evidence for the Y& L all cast brass WW2 badge (some poor and some v good quality)can be found in the battalion diaries of the 8th & 9th Battalions Y & L. These state that in 1942 & 1943 the men were allowed to purchase badges in the bazzars; due to lack of equipment they were allowed to buy both clothing & badges there. If you would like to check, I think the pages are March or April of those years. I would suggest to a lot of people to read the battalion diaries as they make very interesting reading. In the case of the Y & L diaries of which I have copies, they tell of unofficial badges being worn & how the dress regulations are not enforced for the sake of morale, especially in the harsh theatres of war, i.e. Gallipoli, India & particularly, Burma.
Thanks Bill, for clarifying that there is an all brass Black Watch badge & that it was worn by the Canadians.
Peter