Sea Cadets
1856 - An organisation was formed , called the Naval Lad's Brigade.
1910 - Became known as Navy League Boys' Naval Brigade.
1919 - Navy League Sea Cadet Corps.
Edit : Dates above may not be accurate
, Australian War Memorial site has "Sennet hat : Boys' Naval Brigade, Victorian Navy" dated c1890's.
https://www.awm.gov.au/collection/C396737
.