Original vintage Nervigol porcelain enamel advertising sign promoting a medical treatment for premature sexual impotence. This rare pharmaceutical enamel sign, measuring 30 x 20 inches, features bold white lettering on a deep blue background. Once displayed for promotional purposes, it is a unique piece of medical advertising history and a striking collectible. Authentic vintage Nervigol advertising sign. Material: Porcelain enamel on heavy metal sheet. 30 x 20 inches. Colors: Blue background with bold white lettering. “Valuable external treatment for premature sexual impotence”. Era: Early to mid-20th century medical advertising. Condition: Considerable rust, enamel loss, and corrosion spots across the surface (see photos). Rare collectible for enamel sign, vintage medical, and pharmaceutical advertising collectors.