George Arthur Sizmur I.S.O.
G.A.Sizmur was the father of J.A.G. Sizmur. He was awarded the Imperial Service Order, and as it is a QE11 one presented in the Coronation awards, I believe that the Coronation Medal that came with the I.S.O. was awarded with it.
He received the I.S.O. for his work as a Treasury Solicitor (Accountancy) it was announced in the London Gazette of 1st June 1953.
The Queen has been graciously pleased, on the occasion of Her Majesty's Coronation, to make the following appointments to the Imperial Service Order: -
To be Companions of the Order. George Arthur Sizmur, Esq. Chief Executive Officer, Procurator General and Treasury Solicitor's Office. (Ruislip, Middlesex.)