SIKH EMPIRE: AR ½ nanakshahi rupee (6.81g), Amritsar, VS1904, KM-19.3D, Herrli-01.12.05, of the VS1885 series; contemporary copper forgery, heavily silver-plated, which accounts for the heavier weight, though it might have been struck much later to the Kashmir rupee weight of 6.80g introduced in VS1927, Fine to VF.
Estimate: 80-120 USD