#2

On sale date of December 15, 1942 pretty much confirmed from Famous Funnies (Eastern Color, 1934 series) #102 feature Let's Get into a Huddle mentions it is now available for purchase. Famous Funnies #102 also had a reported on sale date of December 15, 1942.

Famous Funnies #101 had a promotional advertisement for Buck Rogers (Eastern Color, 1940 series) #5, Big Chief Wahoo (Eastern Color, 1942 series) #2, and Dickie Dare (Eastern Color, 1941 series) #4 implying all released near the same time. Issue #102 stated all three were available to purchase. A copy of Buck Rogers #5 has a penciled arrival date of December 15, further indicating on sale date for all three titles.

Indexed from scanned copy at https://digitalcomicmuseum.com