The badge is embossed on the back "Reg. at St Johns Gate". I believe this to be an Officers' Cap Badge, King's Crown with two intact lugs.
Vintage St John Ambulance Officers Cap With Kings Crown Cap Badge
St John Ambulance. Senior Officers Cap Badge. Red / White Enamel. LB & B Maker
St John Ambulance Association Medal Engraved To John A Wilson 17/05/1956 Vintage
St John ambulance Assoc medal - Lily Booth, Silver 1927 - family - genealogy
Vintage St John Ambulance Industrial First Aid Case Large Tiered Cantilever Box
An vintage Order of St John Ambulance badge enamelled cufflinks
