The finely-rendered character illustrations in the ad are not from Disney’s “Alice in Wonderland,” released in 1951. The illustrations are not in the style of John Tenniel whose work appeared in Lewis Carroll’s original novel, nor are they from the Classics Illustrated version of “Alice.”
The Philco ad is a fascinating piece of vintage advertising. The level of detail in the illustrations suggests that a skilled, yet uncredited artist was behind them. It's possible that Philco's ad agency commissioned a freelance illustrator or used an artist who was well-known at the time but perhaps not widely recognized today. Vintage advertising often featured unique artwork created specifically for the campaign.