Error Coin, Republic India, Cupro-Nickel 2 Rupees,&nbsp;2001,&nbsp;Dr. Syama Prasad Mookarjee Centenary,&nbsp;both side double strike, leaving die doubling on first strike &amp; rotational hammering,&nbsp;5.96g, 27.16mm,&nbsp;about extremely fine,&nbsp;Extremely rare in commemorative series.

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