SIKH EMPIRE: AR nanakshahi rupee, Amritsar, VS11900 (error for 1900), KM-22.6, Herrli-01.12.04, VS1885 series, NGC graded AU53, RR. It is also possible that the engraver took a VS1900 obverse die, with the two "zero's" vertical as is normal for that year, intending to alter the date to VS1901, but inadvertently engraved the "1" to the left instead of to the right.
Estimate: 150- 200 USD