The Duke of Sussex asked a friend to place the note and a wreath at the Burma Star Memorial in Staffordshire following the national service of remembrance last Friday.
Charles, 76, looked relaxed as he was snapped driving himself and Queen Camilla to Crathie Kirk, in Scotland, where the pair are enjoying their summer holiday.
Queen Camilla donned a white ensemble on Friday as she and her husband were moved to tears by the powerful first-hand testimony of VJ veterans at the National Memorial Arboretum in Staffordshire.
Friday'S VJ Day 80th anniversary commemorations may have been overshadowed in budget and scale by those to mark D-Day and VE Day - but they were no less moving.
William and Kate, both 43, this morning praised the 'courage, sacrifice, and resilience' of those who fought in the Pacific and Far East on the 80th anniversary of VJ Day.