It was considered the bible of gold and the miners. I saw many tiny little penny stock pink sheet explorers go vertical thousands of percents higher. Before 1975 we weren’t allowed to own gold, so he put his readers into the miners around 1964 and they got a great ride.
If you came in late and high, you lost because he waited too long after the peak to flash the sell order. He was the pioneer of technical analysis, wrote a book on that and it became a very expensive collectible book. Used worth $500 today on Amazon. Ebay has one for $1500.
https://www.ebay.com/itm/154824308775
In the beginning it was strictly fundamental analysis. He worked for kidder and company, there newsletter and he was recommending gold and silver miners in the early ’60s. and if you were caught looking at a chart you’d get fired. They called him a kook and fired him and he started his own newsletter.
He was very good at spotting new uptrends in various places. He was very early on very many sectors but always waited too long to sell.