Sepia postcards were printed in a brown colour instead of black inks, and went in and out of fashion from the early 1900s through the 1940s.
[Original caption] General Post Office. The general buildings of Madras are more than usually handsome. Along the seafront stretching north from the Esplanade are the General Post Office and the Bank of Madras, the Custom House, etc.
Postcards of post offices at the turn of the century were quite popular, as if celebrating an institution and network that was becoming more important as image postcards and communication volume increased throughout the continent.
The GPO in Bombay was already the largest post office in India when this card was produced in 1899, with tens of millions of postcards passing through in a city of less than a million.