Small silver Iranian coin - need ID help

Can someone help me with the denomination and date for this coin? About 15mm.

Thank you!

 

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Naser Al – Din shah qajar ( 1246 – 1313 AH) or ( 1831 – 1896 )
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Minted in Tehran - silver - robi ( quarter of rial ) very rare coin
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I coud not read the date . onle for me 13 is clear