Watch List notes:

Republic India, 2018, 500 Rupees, 666666, Super Solid Number (9 times 6), Signed by Urjit R. Patel, S Inset, FF Prefix, S. No. 6FF 666666, graded by PMCS as 58 AUNC, Very Rare.

Note: This fancy number banknote contains numeral 6 9x times: the alpha-numeric Prefix FF which is at the 6th number position in the English language is considered as numeral 6. It is popularly known as Super-Duper Fancy Number amongst Indian collectors.