Here is a picture of an intact luxfer. Luxfer seems to be what they are called. I came across this one in Collins Street and three different ones in Russell Street. This one was unbranded but one other showed the name Brooks and Robinson and another just Luxfer.
Now this was an odd thing. I typed British Luxfer into that very large search engine and came across my own post via this site. I quickly also came across this post by Miss Diarist.