What we have here are the front and back covers of Double Action Detective from 1957. You'd think I'd get used to it, but even after all these years, I'm amazed at how prolific Robert Silverberg was in the late '50s. He must have been writing two or three short stories a day plus a novel on the weekends. On a typewriter. I find it incredible. And he wasn't writing just one kind of story. Science fiction, crime, erotica, westerns, you name it and he was writing it.
And I love the back cover ad. What man wouldn't want his own portable bar, one that "adds class to every gathering, and points up the cleverness of its proud owner." And for only $4.98. Plus 63 cents postage, of course. Those were the days!