of its own, and instead would rent WBAY out for commercial use, $40 for 15 minutes daytime, $50 during evenings, which, using an existing telephone term, was called "toll" broadcasting. However, initially there was very little interest in this idea, and in order to begin service the company had to start broadcasting its own programs. The debut broadcast over WBAY, of recorded music, took place on July 25, 1922. That station's signals were found to be weaker than expected, so on August 16 broadcasting operations were transferred to the WEAF transmitter located at West Street. It was later reported that the first WEAF broadcast included the singer Marguerite Dunlap. On August 28, 1922, WEAF broadcast its first sponsored program, a roughly 10-minute-long talk anticipating today's radio and television infomercials. This promoted an apartment development in Jackson Heights near a new elevated subway line (the IRT's Flushing-Corona line, now the number 7 line). Although often credited as the first radio commercial, there are reports that a few other stations had already quietly carried paid programs. In September 1922 the Department of Commerce set aside a second entertainment wavelength, 400 meters (750 kHz) for "Class B" stations that had quality equipment and programming. Both WBAY and WEAF were assigned to this wavelength. The original issues with the weak WBAY transmissions from 24 Walker Street were eventually solved, and AT&T returned to that site as its primary transmitter location. Because the WEAF call letters were now well known, the two stations swapped call letters on May 12, 1923, with WBAY becoming WEAF, and WEAF becoming WBAY. Because of this, FCC records list WFAN's "First License" as April 29, 1922, which is when the first license was issued for WBAY at Walker Street. (The new WBAY later became WECO, and was deleted on November 6, 1924). Effective May 15, 1923, additional "Class B" assignments were made available, with New York City-Newark allocated three frequencies, including 610 kHz, and WBAY and WEAF were reassigned to this new frequency. Network operations and the "WEAF chain" {{Gallery | title = | height = 170 | width = 160 | align = center | footer = |File:Milestone 1922.jpg |Helen Hahn in the WEAF studio, 1922. |File:Couple married on radio 1923.jpg |WEAF broadcasting Margaret Girstner and Joseph Woorm's wedding, 1923. |File:Eveready Hour 11-4-1924 WEAF.jpg |The Eveready Hour'''s election night broadcast from WEAF to 18 stations on November 4, 1924: