The production in city puts an identification mark under the year of issue which is called as 'mint mark'.
Mumbai - diamond
Kolkata - no mint mark
Hyderabad - split diamond / dot in diamond / star
Noida - round dot
Taegu, Korea - star below first digit
Seoul, Korea - star below last digit
Royal mint, Ottawa, Canada - C
Royal mint, London, UK - diamond below first digit
Birmingham, UK - H below last digit
Pretoria mint, South Africa - M in oval
Tower mint, UK - U
Mexico city - M beneath O
Slovakia, Kremnica - MK in circle
Moscow, Russia - MMD in oval
For more details of the Mint Indian coins kindly visit the following website
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