This is the ₹500 "Dandi March" note, including the sought-after first issue carrying the signature of governor R.N. Malhotra. The design commemorates Gandhi's historic salt march, which gives the note its name.
First issues are special to collectors because they mark the debut of a design and were printed before later, more common runs — a genuine first issue in collectable grade is markedly harder to find. The governor's signature and the note's grade both shape its appeal, and the Dandi March design is among the more admired older ₹500 notes.
What such a note fetches depends on the signature, whether it is a true first issue, and its grade and condition. Coinbazzar lists verified notes so you can confirm the issue and signature before buying. See the live listing on this page for its current price and availability.