Watch List notes:

Cooch Behar, Mada Narayan (1663-81), Half-Rupees (9), dated year 171 of the Cooch Behar era (where visible), legends on both sides, Śrī Śrī/ Śiva Charana/ Kamala Madhu/ Karasya, rev. Śrī Śrīma/t Mada Nārā/yanasya Śāke/..., all slight variants (RB. 59; Bose E-1.4, 5, 6, 7, 8, 9, 10, 11, 12; KM. 91), about very fine to good very fine (9).
Ex. Nicholas Rhodes Collection

The coins of Mada Narayan sometimes show part of a date but as the flans are much smaller than the dies, most coins do not show any date.
Estimate: £60 - £80