Rare – Extra Large BMW Dealership Enamel Metal Advertising Sign. Bayerische Motoren Werke AG. Offered in good vintage condition and ready for display. The sign has some light enamel loss around the edge from previous dealership display. Extra Large Size: 59.5 Cm Diameter x Depth 3 cm. This a very collectible sign for all BMW Automobile enthusiasts. Estimated Age: Circa The Late 20th Century. Ideal display sign for a Garage, Workshop, Showroom or Dealership.