Well, for this specific item in Numista, its reverse shows it is an error striking of the Kriegerverdienst medal. Besides the versions in www.zeno.ru/showphoto.php?photo=76047 there are more, like the two on www.zeno.ru/showphoto.php?photo=120918
The last are signed E W like the one in Numista. Pictures on 76047 are to small to see. I should find some better ones.
Then 5 rupien would have had a weight of 58 grams, way over any other coin in circulation.
By size it could have been ment to be a Maria Theresia thaler, but that would not fit in the pesa rupee system.