U.N.C.L.E. was a kludgy acronym for United Nations Command for Law and Enforcement in case you were wondering and the show premiered in the fall of 1964 in the explosive wake of the James Bond action thrillers. The first inside page is where all the action is as far as I'm concerned though:
The content is clearly written for boys about 10-12 years old, which is no surprise. But take a look at that indicia:
It would seem Topps and/or possibly Solomon & Gelman's art agency put together the Wonder Book for Grosset and Dunlap as we have previously disclosed Robert Shorin was the son of Topps co-founder Abram Shorin and Barbara Gelman was Woody Gelman's daughter. Woody appears of course, as does Topps Art director Ben Solomon.
The interior of the magazine has at least one shot that also appeared on a card (and likely more but I do not have a set handy to examine in detail):
That's a match to card # 7 in the 55 card series:
Len Brown revealed in an interview some years back that the Topps Fan Magazines made a profit but not enough of one to warrant continuation of the series. The two extant issues are a true curiosity in the world of Topps in the mid-60's.