PANJIM, Jan. 23 -- One can often see him heading groups of people, locals and tourists alike, on educational walks around the state capital. But while the average guide might focus on popular sights and areas, Vishal Rawlley takes great interest in explaining to his clientele the history and heritage surrounding the centuries-old, Portuguese era signboards that still adorn the entrances of many family-run businesses in Panjim.

The environmental activist and educator is particularly interested in the handcrafted and meticulously painted wooden signboards dotting Sao Tome, mainly around the Tobacco Square. He says these distinctive works of art not only convey the name of the family owning the business but also the type of trade they've be...