WWI - Canadian - CEF Locket - Soldier Photo - Attributed 157th Battalion / Canadian Machine Gun Corps

A WWI Canadian General Service Button converted to a locket with a photo of a soldier. The bezel is impressed with what appears to be: R.B. 642303. This was the CEF service number assigned to Robert Beaulieu - who joined the 157th Battalion and served overseas with the 4th Machine Gun Battalion. This attribution is not confirmed. A nice period item nevertheless.