New find:

Beutron Originals: plastic

Uniform buttons: Stokes

Corps of Staff Cadets, Kings crown

This is the Australian Army corps that trainee officers are assigned to after initial training.

British: Machine Gun corps by  J. Gaunt & sons.

Machine Gun Corps

It was formed in October 1915. Part of the corps would become the tank corps.

New Zealand sweetheart brooch:

This New Zealand artillery button by Stokes & Sons was made into a sweetheart brooch.