5 Rupees

The KM#148.2b designation marks a material change from earlier versions of this circulating type, which had previously been struck in nickel-brass and bimetallic configurations as Sri Lanka periodically adjusted coin specifications in response to metal cost pressures. Stainless steel became the practical solution for higher-denomination circulation coinage across South Asia during this period, adopted by India, Pakistan, and Sri Lanka in overlapping windows for precisely the same economic reasons.