Very nice looking King's Crown patch also known as an Imperial Crown or Tudor Crown. I am not well versed with British insignia but this does look WWI to me. Attractive patch constructed very much like bullion insignia but in soft, neutral browns. There is a small nip above the left fleur. The research I put into this indicates this was rank insignia for Warrant Officer in Australia or Squadron Corporal Major, Company Sergeant Major etc in the British Army. Nice patch.