What else did you find in that wall "vault?"
I saw the
green check mark, but I also noticed the "Reply to this topic" option was still activated, so I didn't think anyone would mind this additional tid-bit of information.
Typically the dating of Coke products can be directly linked to specific word useage. In this case we have, "Minimum Contents - 6 Fluid Oz - Reg U.S. Pat Office." In the snippet below from my "Coke Bottle Checklist" booklet, you will see various word desiginations found in chronological order for the earlier (1915 thru 1965) bottles that Coca Cola used over the years. (Also know as the "Hobbleskirt" - "Contour" or "Mae West" bottle). These particular dates are for the "embossed" bottles. The painted labels (ACLs) were introduced around 1957 thru the early 1960s.
Thus, your bottle cap, although shown with a slightly different wording below, would fall into the number 4. range ... 1951 thru 1958.
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Regarding antidotes, the least I recall paying for a bottle of Coke was ten cents, with a two cent deposit. My friend's uncle used to own a gas station that had one of those lift-top soda pop coolers. It was the type where you had to slide your selected bottle along the hanging track, and then pull it through the release chamber. And even though there were many times when the uncle would give us free drinks, there were also times when we would "help ourselves" and un-cap one or more of the bottles while it was still hanging, and then insert a straw into it and sip out the contents without paying for it. Never once did we get caught, but there was little the uncle could do to prevent this sort of thing. Of course, because of the empty bottles, he always knew "when a mouse had been in the cupboard!"
Take care ... and ... "Have a Coke and a Smile!" < Introduced in 1979
SODABOTTLEBOB
P.S. Here's a quick link for other slogans and dates.
http://en.wikipedia.org/wiki/Coca-Cola_slogans