India Republic 2021- B  75th year of independence, Error coin Rs 5 & 20( Date Error) 

The actual 75th year of independence is year 2022 ( 1947-2022).

Mumbai mint minted a few coins in 2021  by an error.

KM # N #  311196 & 527.

Bimetallic coin :

Shipping by Registered mail, india post.

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