a political convention (the 1940 Republican National Convention, held June 24–28 in the Philadelphia Civic Center) seen also on W3XE in Philadelphia (now KYW-TV) and W2XB in Schenectady (now WRGB); and the broadcast of the feature film The Crooked Circle on June 18, 1940. In August 1940, W2XBS transmissions were temporarily put on hold, as "Channel 1" was reassigned by the FCC to 50–56 MHz; technical adjustments needed to be made for the conversion. The station returned to the air in October, just in time to broadcast Franklin D. Roosevelt's second and final appearance on live television, when his speech at Madison Square Garden on October 28, 1940, was telecast over W2XBS. First commercial television station On June 24, 1941, W2XBS received a commercial license under the calls WNBT (for "NBC Television"), thus becoming one of the first two fully licensed commercial television stations in the United States, alongside CBS' WCBW on channel 2 (now WCBS-TV), which had evolved from experimental W2XAB. NBC and CBS were instructed to sign on simultaneously on July 1 so that neither of the major broadcast companies could claim exclusively to be "first". However, WNBT signed on at 1:30 p.m., one full hour before WCBW. As a result, WNBC (and essentially, NBC) inadvertently holds the distinction as the oldest continuously operating commercial television station (and television network, respectively) in the United States, and also the only one ready to accept sponsors from its beginning. The first program broadcast at 1:00 p.m. EST by the sign-on/opening ceremony with the U.S. national anthem "The Star-Spangled Banner", followed by an announcement of that day's programs and the commencement of NBC television programming. WNBT originally broadcast on channel 1. On its first day on the air, WNBT broadcast the world's first official television advertisement before a baseball game between the Brooklyn Dodgers and Philadelphia Phillies. The announcement for Bulova watches, for which the company paid anywhere from $4.00 to $9.00 (reports vary), displayed a WNBT test pattern modified to look like a clock with the hands showing the time. The Bulova logo, with the phrase "Bulova Watch Time", was shown in the lower right-hand quadrant of the test pattern while the second hand swept around the dial for one minute. Although full commercial telecasting began on July 1, 1941, with the first paid advertisements on WNBT, there had been experimental, non-paid advertising on television as far back as 1930.