Sometimes you don't need fancy business models or hyped stocks. Often, the most boring stocks and simple business models can generate super returns over a long holding period.

One such example is the U.S. company AutoZone. The company is the second largest distributor of automotive aftermarket parts in the United States, headquartered in Memphis. The company was founded in 1979 under the name Auto Shack, then changed its name to AutoZone shortly thereafter due to a trademark lawsuit filed by RadioShack. Today, the company has nearly 6,800 stores in the United States, Mexico and Brazil.

Earnings per share last quarter were $25.69, $4.73 above expectations. Revenue also beat expectations by $290 million. Total sales were just under $3.7 billion, up 16.5% from the year-ago quarter. Stores that have been open longer posted 13.6% year-over-year sales growth.

On a one-year view, the stock is up more than 60%. The 10-year performance is over 450%. Over the past 20 years, the stock has generated an average return of 20%, significantly outperforming the S&P 500.

Which "unknown bores" do you know that have generated very good returns so far?