A while ago in one of his Four-Color Shadows posts, Booksteve presented the Captain America story "Double Identity" from All Winners 1 (Aug/48—the only issue in volume 2) and noted that the Grand Comics Database attributed the art to Syd Shores, but it didn't look much like Shores' art. I was certain the Shores ID was wrong, but had no better guess to offer at the time. Now I do.
Mort Leav is supposed to have done a handful of Captain America stories around 1946-48. This looks like one of them. Leav's work at Orbit (where he went in 1948) looks very much like the art on "Double Identity." This Wanted story, signed over the open "S" in the first page's blurb (click the final scan below to decipher at larger size), is "International Enemy No. 1" from #13 (May/48). The amoeba-bordered vignette panels opening both my examples, where the figures end at the edges of the neckties, present a very obvious similarity, and are a choice I don't recall Shores using.
So IDing this one story leaves a handful (minus one) of Mort Leav Caps to track down.