Original vintage Raval Tiles Bombay porcelain enamel advertising sign. Bold yellow and black design with the text Raval-Tiles (Bombay) Are Used In This Building. Slight dome/convex type enamel sign, giving it a dimensional display look. Great collectible for advertising, architectural décor, and Bombay history. Displays beautifully with authentic age and character. Type: Porcelain Enamel Advertising Sign. Brand: Raval Tiles (Bombay). Shape: Rectangular, Slight Dome Convex. Size: 12 x 9 inches (approx). Color: Yellow & Black. Material: Porcelain Enamel on Metal. Era: Vintage / Mid 20th Century. Theme: Tiles, Building Materials, Advertising.