100 Rupees 100 Years of Ol Chiki Script

Ol Chiki script was created in 1925 by Pandit Raghunath Murmu, a Santhali educator who devised the alphabet specifically to represent the phonemes of the Santali language — sounds that the Bengali, Odia, and Latin scripts previously pressed into service could not accurately render. Murmu spent decades promoting its adoption against considerable institutional resistance before it gained official recognition in India's Eighth Schedule in 2003.

The .500 fineness here is worth noting: Indian commemorative rupees of this denomination routinely use this quaternary alloy rather than sterling, a cost-containment practice that dates to the early post-Independence commemorative program.