India Post is one of the oldest and the largest postal system of World. For providing postal services, the whole country has been divided into twenty two postal  circles. Each of these Circles is headed by a Chief  Postmaster  General. Each Circle is further divided into Regions comprising field units and  Divisions  (Postal RMS  Divisions).  Besides Circles and Regions there are other functional units like  Stamp; Depots, Postal Stores Depots and Mail Motor Service, etc.
Besides  twenty Circles, there is another Circle, called Base Circle, to cater to the  postal  communication needs of the Armed Forces. The Base Circle is headed by an Additional Director  General of rank of a Major General
The postal services offered include registration of letters and parcels, booking of value payable letters and parcels, booking of money orders, certificate of posting, sale of stamps and postal stationary etc. Various premium services are also available at selected post offices.
Post offices besides offering postal services, also offer banking services, speed post, money transfer services, life insurance schemes, pension payment, payment of telephone bills, electricity bills etc. as an agency function.
Booking was open till 31 March 2005 by  India Governmint Mint for 100 Rs Coin & 1 Re Coin. Hundred Rupees Coin is of Quaternary Alloy (50% silver, 40% copper, 5% Zinc and 5% Nickel), Circular in shape with 44 mm dia and weight 35 gms.  One Rupee Coin is of Ferritic Stainless Steel, Circular in shape (25 mm dia.) weighing 4.8 gms
COMMEMORATIVE COINS ON 150 YEARS OF INDIA POST
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Miniature Sheet Issued by India Post on its 150th Anniversary
INDA POST
Visit Indiapost Website
Stamps by India Post on 125th Anniversary of Ghandhiji
Gandhi Stamps
Stamps on Water Birds later withdrawn