David Sundman of Littleton Coin Company writes:

For over 70 years, Littleton Coin Company has brought the excitement of collecting by sending stamps, coins and paper money to customers through the mail. Since 1945, from our Littleton, New Hampshire headquarters, we've provided customers with friendly, knowledgeable and dependable service. Today, thanks to the U.S. Postal Service, thousands of collectors across the country have shopped at Littleton Coin to begin collections, add to existing ones or to find unusual items to share with their friends and families. But Littleton's history of bringing the "coin store to a customer's door" via packages in the mail, goes back even earlier than that.

It all began in 1927, when rain forced 12-year-old Maynard Sundman and his friend inside. Billy showed him his stamp collection. From then on, Maynard was hooked. Although he received stamps through the mail from businesses far away, he spent hours studying ads offered by various companies. The same year the stock market crashed in 1929, setting off the Great Depression, Maynard turned 14. That year he noticed an ad for a free H.E. Harris stamp catalog and sent away for it. Inside he found an article: The Future of the Stamp Business. He had been selling penny stamps to other student collectors for a few years, and that article fueled the dream of starting his own business.

1935-41 The Maynard Sundman Stamp Company
After graduating from high school in the summer of 1935, he opened the Maynard Sundman Stamp Company with a $400 order he made from H.E. Harris. (Later Harris would serve as his mentor, teaching him key lessons about the mail order business.) Working from a table in his parents' kitchen in Bristol, CT, he sent stamps on approval through the mail to customers across the country. With stamps on approval, he placed his trust in his customers, believing that if they saw the stamps to "approve" before they paid for them, they would be happier with their purchase in the long run. Maynard's business blossomed that first year, even during the depression, and he hired four neighbors to help fill orders.

To read the complete article, see:
Stamps started it all - Littleton Coin Company Over 70 years of Building Collections via the Mail (http://postalmuseum.si.edu/americasmailingindustry/Littleton-Coin-Company.html)