I just borrowed issues 3,5 & 8 to review for the GCD and I simply don't know if the Sheena strips are collected from non-U.S. first appearances.
I own copies of
JUMBO #4,10 & 12 and can verify that to up to the point of #12 there were still some reprinted strips from
WAGS being used. The easiest strip to verify is
"The Hawk/Hawk of the Seas" by Eisner, which is made up of
WAGS strips cut up and re-pasted into the smaller format. But
"Hawks" had a head start on
"Sheena" in
WAGS of several months, so there were more strips available for reprint when
JUMBO began.
I have never seen an issue of Wags, so I don't know how many strips (of pages of strips) they were printing each week.
I also own two copies of the Aussie version of
WAGS: vol. 2, #13 & vol. 2 #36. It's hard to exactly date these issues since the indicia only lists the year, but from the dates on some of the non-Eisner/Iger strips in them, it appears that the #13 is from July 1937 and #36 from Sept. 1938. This tabloid was published weekly according to the indicia, but based upon the numbering, that frequency seems doubtful. Neither issue contains a
"Sheena" strip, unfortunately, so I don't know if that means it didn't appear in
WAGS until after Sept. 1938, or if it appeared on a rotating basis and I just happened to have two issues that don't have an appearance.
There were eight Eisner/Iger strips per issue, in black and white and inserted into the tabloid as if they had been produced separately from the rest of the material. The other material is made up of standard American comic strips such as
"Terry and the Pirates",
"Alley Oop",
"Moon Mullins",
"Tarzan" and others. These were printed in color. Interestingly, the cover to #13 is a
"Moon Mullins" cover which looks to be drawn by Eisner. I know he drew some of these covers and he did a good job of aping the various styles of the featured strip.
I'd love to be able to scan in these comics for the GAC, but they are all very fragile. I'll try to at least get a scan up of the Eisner
"Moon Mullins" WAGS cover.
--Ken Quattro