The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1944, New Series, Vol. 39, No. 1.
The early versions of this strip, like this story, are set in some sort of fantasy world which looks more or less like the contemporary USA but where everyone has little angel wings and there are various other surrealistic touches. Eventually the strip changed to a standard domestic comedy.
With stamp ads.
On the top half of six pages.
On the bottom half of six pages.