80-year-old marketing lessons still apply

I recently ate at a restaurant whose decor included old advertising posters. An ad for coconut oil shampoo from 1925 fascinated me.
Why? Because it used so many of the modern copywriting principles we copywriters try to incorporate. It started with a benefit oriented headline, continued with social proof in the first sentence, quote thousands of users unquote, and then went right into long copy with a lot of benefits.
1925!
I’d love to know what copywriter has this in his or maybe her portfolio. Guessing it might have been John Caples.
Ha ha, for sure.