Fire Brigade Union FBU firemans membership badge

A good original post 1930's period 'Fire Brigade Union membership badge'; chromium plated circular example with firefighters helmet mounted to the top, the centre bearing 'FBU' initials on blue enamel ground; the reverse impressed with maker's details 'Thomas Fattorini Ltd Regent St. Birmingham'. Very good condition, complete with original buttonhole fitting, no damage to the enamel. Height 27mm.