Watch List notes:

INDIA: Republic, Proof Set (2 pieces), 1975, KM-PS20, RB-49, contains Equality, Development, Peace commemorative copper-nickel 10 rupees & silver 20 rupees, with certificate, in original box of issue (in decent condition), Proof, R. According to Rajob, Sharma & Agarwal, there were only 160 of these sets produced, "sold only for export at a special export price." If that is correct, this (and several other proof sets of 2 pieces) must indeed be extremely rare.

Estimate: 80-100 USD