NewMexiKen posted this just a year ago but I enjoyed reading it again and thought you might too.
In 1938, wallet manufacturer the E. H. Ferree company in Lockport, New York decided to promote its product by showing how a Social Security card would fit into its wallets. A sample card, used for display purposes, was inserted in each wallet. Company Vice President and Treasurer Douglas Patterson thought it would be a clever idea to use the actual SSN of his secretary, Mrs. Hilda Schrader Whitcher.The wallet was sold by Woolworth stores and other department stores all over the country. Even though the card was only half the size of a real card, was printed all in red, and had the word “specimen” written across the face, many purchasers of the wallet adopted the SSN as their own. In the peak year of 1943, 5,755 people were using Hilda’s number. SSA acted to eliminate the problem by voiding the number and publicizing that it was incorrect to use it. (Mrs. Whitcher was given a new number.) However, the number continued to be used for many years. In all, over 40,000 people reported this as their SSN. As late as 1977, 12 people were found to still be using the SSN “issued by Woolworth.”
Interesting Facts About Social Security Numbers at Money, Matter, and More Musings
The 40,000 are the same sort of people that some politicians would have manage their own social security investments.