Tin Hat Day was started in 1922, following WW1, as a fundraiser for the RSL. Money raised was for returned servicemen who were doing it tough following the war and during the Great Depression.Tin Hat Day Collector's Permit: Cream Oval label with blue cotton string through a hole for attaching.. In blue print * Returned Soldiers League War Service Fund (Affiliated with the A.C.F.) Tin Hat Day. Sept. 6th 1940 Collector's Permit. Thorold Fink, Chairman 1940 No. 992. Box 625military, world war 2, returned soldiers league, tin hat day. thorold fink.