1957 (denominated in naya paisa—decimal currency) and a 1965 series with a wide variety of images. The old inscription "India Postage" was replaced in 1962 with "भारत INDIA", although three stamps (issued from December 1962 to January 1963) carried the earlier inscription. India has printed stamps and postal stationery for other countries, mostly neighbours. Countries which have had stamps printed in India include Burma (before independence), Nepal, Bangladesh, Bhutan, Portugal and Ethiopia. The country has issued definitive and commemorative stamps. Six definitive series on India's heritage and progress in a number of fields have been issued. The seventh series, with a theme of science and technology, began in 1986. Between independence and 1983, 770 stamps were issued. Losses The postal department has always been the biggest loss-making entity in India, surpassing others like the Air India and BSNL, with an annual loss to the exchequer to the tune of ₹15,000 crore in the fiscal year 2019, and amounting to ₹15,541 crore in the calendar year 2020. The following table shows losses incurred by the postal department over the years. PIN The Postal Index Number (PIN, or sometimes redundantly PIN code) is a six-digit postal code. The PIN system was made by Shriram Bhikaji Velankar when he was at service in Kolkata. It was introduced on 15 August 1972 by former Prime Minister Indira Gandhi. There are nine postal zones in the country; the first eight are geographical regions, and the ninth is reserved for the Army Postal Service (APS905898). The PIN system is organised in the following way: The first digit indicates the zone. The first two digits indicate the sub-zone (or postal circle). The first three digits indicate a sorting district. The first four digits indicate a service route. The last two digits indicate the delivery post office. The PIN for an address may be found on the Postal Service website. There are total of 19,101 PINs covering 154,725 post offices in India, with the exception of the Army Postal Service, 2014. Digital Address Code Indian post proposed a 12 digit unique identification number to each and every address in India based on geo coordinates. Draft approach paper on Digital Address Code was issued by Indian Post for public comments. Project Arrow Project Arrow was launched in April 2008. The project plans to upgrade post offices in urban and rural areas, improving service and appearance into a vibrant and