The first real TV commercial to air in the United States was a short, simple spot for the Bulova Watch Co. This commercial focused on a watch as its second hand ticked.

With a cheerful voice over, the ad told viewers what time it was, according to Ad Age (a leading global source of news, intelligence, and conversation for marketing and media communities). The ad at the time cost the company just $9.00 (USA): $4 in air charges and $5 in station charges.

More Info: qz.com