I believe Walla Walla Coin Company preceded W. H. Foster Inc and Hercaimy Coin/Enterprises. In other information, Bob Naimy states he ran a company with the “same corporate structure since 1958” and I believe Naimy probably owned this company, especially with the similarities to Hercaimy ads.

They ran just a few newspaper ads in 1964 that look remarkably the same as Hercaimy ads.

January 7th, 1964 from Montana:

William Foster made the news for purchasing a $6695 coin in 1964 and was mentioned being connected with this company: