Watch List notes:

Independent States, Mysore, Tipu Sultan (1783-99), Double-Rupee (Haidari), Patan (Seringapatam), AH1199, ry.3 (1787) (Henderson 43; KM 127), 2-Rupee, AH1199 / 3 (1787) (KM 127), graded by PGCS AU55 (246607.55 / 39861194), a rare and desirable coin.
Tipu named his double-rupees 'Haidari.' Although its literal meaning is 'lion' this was also the name of the fourth Caliph and first Iman Ali, and also that of Tipu's father, Haidar Ali.
Estimate: £6,000 - £8,000