A specific type of 500 rupee note that collectors consider rare and valuable due to its serial number containing "786," which holds cultural significance for some individuals. In certain cultures, the number 786 is associated with blessings or auspiciousness.

If someone possesses a 500 rupee note with the serial number "786," and if there's a high demand for such notes in the collector's market, they may indeed be able to sell it for a significant amount of money, as you mentioned, potentially up to 5 lakh rupees or even more depending on its condition and other factors.

However, it's important to note that the value of collectible currency notes can vary based on factors such as rarity, condition, historical significance, and current market demand. Additionally, the legality and authenticity of such transactions should always be ensured.

Individuals interested in selling or buying collectible currency notes should research thoroughly, consult experts if needed, and use reputable platforms or dealers to facilitate transactions.

Collecting old currency notes can indeed be a lucrative hobby for some people. The value of these notes often increases over time due to their rarity, historical significance, or aesthetic appeal.

The process of becoming a millionaire through collecting old currency notes usually involves a combination of factors:

1. Acquiring Rare Notes

2. Building a Collection

3. Understanding Market Trends

4. Selling at the Right Time

5. Utilizing Online Platforms

By leveraging these strategies and taking advantage of the growing interest in numismatics, some collectors have indeed turned their hobby into a profitable venture, earning significant sums of money from selling old currency notes. However, it's important to note that success in this field requires dedication, research, and a passion for collecting.