Porcelain enamel advertising sign from India, written in Hindi script. This rare pharmaceutical enamel board promotes an Ayurvedic children’s tonic made by. Bal Vaidya Mangalal Bhai Shastri, Petlad. The blue and white enamel design features bold Devanagari lettering with a slogan highlighting its health benefits – removes weakness and increases strength in children. A genuine piece of early Indian advertising history representing regional Ayurvedic medicine and hand-crafted enamel signage. Product: Shastriki Vishnik (Ayurvedic children’s tonic). Brand / Proprietor: Bal Vaidya Mangalal Bhai Shastri, Petlad, India. Material: Porcelain enamel on metal. Color: Blue background with white lettering. 12 x 6 inches (30.5 x 15.2 cm). Era: Mid-20th century (circa 1940s-1960s). Category: Vintage Indian enamel sign / Ayurvedic advertising collectible. Condition: Surface rust at edges and minor enamel losses consistent with age and display use.