National Brand Petrol Shell-Mex and BP Ltd advertising key fob badge

A good original circa vintage period 'National Brand Petrol Shell-Mex and BP Ltd promotional badge'; chromium plated example depicting the stylised 'Mercury head logo' in yellow, darker blue and white enamel; the reverse impressed with maker's details 'R.SCULTHORP & Co LTD BLACKFRIARS HOUSE LONDON E.C4'. Good condition, minor service wear.Size approx 31 x 28mm.