CALL ME SWEETHEART song sheet music promotional badge

A scarce original circa 1935 'Call Me Sweetheart song advertising badge', gilt brass example depicting lovers within a blue enamel heart; the reverse with maker's details 'H.W. Miller Ltd Branston St B'Ham 18' ' 'Regd Appd 804658' (a registration, design and patent date for the year 1935) . Very good condition, complete with original coiled pin fitting and hooked catch, no stress marks or damage to the enamel, very minor surface scratches. Height approx 24mm.