Zanzibar1881(1299 AH ) Copper Paisa Coin- Please Guide - Rotational Error

Zanzibar East India Company Tarazu Copper Coin ( 1/4 Anna = 1 Paisa ) 1881 ( 1299 AH )

Please click here for its Image

http://www.worldofcoins.eu/forum/index.php?topic=4174.0

We have a Coin like this with 180  * ( upside down ) Rotational Error

Please Guide whether this Error makes the Coin a Rare Coin.

Regards

Ashwani Kumar Aggarwal

email : akaj188@gmail.com