How did Harry Burt sell his very first product?

There's no widely known information available about a person named Harry Burt selling his first product. It's possible this is a fictional character or an individual without a public record of their entrepreneurial journey.

To find information about a specific person's first product sale, you would need to research their biography, business history, or look for interviews or articles they may have given about their early career.

If you could provide more context about Harry Burt, such as his profession, industry, or any specific products he may have been known for, it might be easier to find information about his first sale.