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[Linked Image from comicislandearth.com]

House ad for WORLD'S FINEST 183 (cover dated March 1969).
The actual interior story is not exactly a masterpiece of the era, but like so many DC issues in that era, with a gorgeous Neal Adams cover,
It's well hyped in a way that makes you want to buy and read it.
I saw the ad in a back issue (in BEWARE THE CREEPER 6), many years before I was able to finally purchase and read the WORLDS FINEST issue in the ad.

https://viewcomiconline.com/worlds-finest-183/