Just took a look at the web sites for both the Black Watch of Canada and of Scotland - the sgean dhus their museums sell now - and presumably that's been the pattern for awhile - have St Andrew and his saltire cross - not the sphinx.

If you want to know more about your find, why not contact both museums and give them your info? They'd certainly have lists of officers and senior NCOs from 1940 and may solve the mystery.

Get the right person enthused and working for you and I'm certain you'll find out more.