The Barrett's Chocolate Bottle is my husband's families own formula of a yoohoo type drink. They owned 6 7-up/Dr. Pepper Bottling Companies including the one in Pittsburg, Tx & Mt. Pleasant, Tx
There are antique stores around this area that sell that Barrett's chocolate bottle for $7
I am so glad to see this particular bottle on this site 
WOW is all I can say. The Fall River Mass Green White Eagle bottle is amazing. I'd be interested in that. The Moxie ones are nice too, always good to see Moxie bottles! I have a few of those, both types. Great GREAT Find. Props to you for taking all those pictures!