Refer to The Medal Year Book Number 313. A Nice example of this Silver Medal.

The Year Book gives us the whole story. With delight Sir William Goscombe John R A designed this medal with its left facing conjoined half length busts of King George V and Queen Mary in Crowns and Robes of State.
"Quartermaster's Comment":- A Total of some 85 234 Medals were issued to the great and good throughout the Empire.