Stumbled upon this card for Einstein. It is apparently his earliest known card and can be found in the 1924 J. Millhoff & Co. "Men of Genius" set. It is a very tough card to find and is probably the most rare of the set. It even mentions "The Theory of Relativity", one of his most important contributions to physics.

For more on Einstein's cards, check the article below:

https://www.si.com/collectibles/inside-the-hobby/collecting-genius-the-albert-einstein-rookie-card?