Every class of post is a real India Post product with real 1990 prices, real rules and real trade-offs. Speed, cost, privacy and length are all in tension — exactly as they were.
Fifteen paise, unchanged from 1974 to 1997. Four lines, and anyone in the chain can read it — the postman, the sorter, your neighbour.
Seventy-five paise in 1990. Folds into its own envelope and gums shut. Sealed — the cheapest private letter in India.
One rupee for the first twenty grams — a rate that held for a decade. Then one rupee for every twenty grams after. More words literally costs more.
₹15 flat, to every country on earth. Paper thin enough to see through. Sealed — and nothing may be enclosed.
Near-instant, and terrifying. Twenty-five words including the address, ALL CAPS, no punctuation. STOP costs a word.