I discovered this pin last weekend in a box of family heirlooms dating back several decades. I wondered if anyone on the forum might help to identify what it might be. My grandfather was with the 2nd division, 17th battery Canadian Field Artillery in WW1 and thought it might have a connection to him. The maker mark is BIRKS STIRLING The pin could be nothing more than a tie clip but it could be a CEF sweetheart pin maybe?
Your opinions are always welcome, thanks.

Click to enlarge the picture