Coca-Cola brand bottles are stamped (typically on the cap) with a sell-by date in MMDDYY format, and stamped (typically on the neck) with a sell-by date in MMMDDYY format. There may be additional codes included with the stamp on the neck that have nothing to do with dating.

How can I find out how much my Coke bottle is worth?

The straight-sided bottles can vary in value from $25 up to around $400, depending on the condition and the uniqueness. Amber-colored bottles, sold widely in the South and Midwest, tend to be more valuable than the clear or light green or flint straight-sided bottles that were more common in other parts of the country.