Brothers In Ink
Friday Comic Book Day.
George Roussos and Mort Meskin were friends as well as collegues. They have both said that they helped each other out on some jobs. But they didn't seem to have worked together as much as that statement might suggest. They did do a couple of stories for Timely/Atlas which they signed together as MR. Here is one of those stories, preceded by a solo Roussos story (which may have been seen somewhere on another blog before, but now you can use it to compare the styles of these two artists).
My best bet is that Meskin is the prime penciller of the second story. You can see many of his later traits.
Froms Adventures Into Weird Worlds #6:
From Mystery Tales #23: