Akbar Square Rupee: Km 82.1

[Rangnath]

With my meager resources, I think I have come close to identifying this coin.  It seems very similar to Km 61.1, a half rupee I found in the Coin Cabinet.  That coin is posted below mine.
Is it not of the Type 86 of Akbar's coinage?   
Apart from the red disease, I have one problem.  My coin is quite light:  10.4 grams.  Is that an indication of a lack of authenticity? 
richie

[Oesho]

Dear Richie,
Why not compare them with some the rupees shown in http://www.worldofcoins.eu/forum/index.php/topic,1373.0.html
I presume that some will look quite identical with your piece.

[Rangnath]

Why not indeed? 
Thanks for the reminder.
richie