That applies to BIMAL meds and cures, inks, etc.
Never heard that for Coke bottles.
I already know about the half seam up neck for 1880's bottles.
Please correct me if I am wrong for sodas, specifically Coca-Cola.
I think it's ABM but I'd need a closeup of the lip to be sure. The thing about dating bottles by how far up the neck the seam goes isn't true, I think it might be something that Kovels made up. The only way you can use the seam to date a bottle is if it runs all the way to the top of the lip, in that case it's an ABM bottle and dates to the early 20th century at the earliest. (Even then there are exceptions, though).
Still working the site. I'm sure I'll find a blob or a med. Just got to keep poking away. Farm dumps are very tricky, they didn't usually dump everything in one area and you have to keep working the...