Walter died late 1921, I would suggest that I.C. 481/1922 was a reference number to show that his medals were issued in 1922
it is not a reference to medals issued.
The Index Casualty (IC) Refers to relevant N.L. (Wills paper) so it is a reference to a deceased person the number being the index casualty number in the Naval Record of Wills. The IC has not survived and does not lead to any further records.
Regards
Hugh
