This is a 20 Rupee note ending in 786, a number many collectors regard as auspicious and lucky. The listing includes UNC single notes ending in 786 and a set of notes all ending in 786 with ascending serial numbers, in Gem UNC condition.
Fancy-number notes are collected for the pattern on the serial rather than the design alone, and 786 is among the most sought numbers in Indian currency. A set where the ending stays fixed while the leading digits step up is harder to gather than a single note and is valued as a group.
What a 786 note is worth depends on the grade, how clean the number pattern is and the overall condition, with Gem UNC examples commanding a premium. Coinbazzar lists verified 20 Rupee 786 notes and sets so you can check the exact serials and grade before buying the piece shown in the video.