Bumping this just because I unexpectedly got some clarity about taping times. A Facebook friend posted a photo of the 1969 Macy's Thanksgiving Parade, and it just so happens that the photo catches the parade as it's passing the Ed Sullivan Theater, and the marquee is advertising tickets for "What's My Line?" Now granted, it's a different year and a different studio, so it doesn't really solve anything about Curt's mystery for sure, but at the Ed Sullivan Theater in 1969, the tapings were on Wednesday at 10:45 a.m., 1:45 p.m., and 3:30 p.m.