Good evening,
Definitely A & S Highlanders, the dicing gives it away. Black Watch and Cameron Highlanders had no dicing on the glengarrie. Of the others, Royal regt's had red white and blue dicing, non royal regt's had red white and green.
Your photo has white alternate squares in the centre row which means you are looking at the red and white dicing unique to the 93rd highlanders. This was adopted by the A & S Highlanders when amalgamation took place.
I knew something was nagging at me , it just came when I looked again after reading your last reply.
John915