How to date a hobbleskirt coke?

[vt910815]

What about bottles that are obviously coke bottles, but no embossed lettering.......its blank so to speak.

 

[CanadianBottles]

Those are ACL Coke bottles where the lettering has worn off. If you angle it correctly you can likely still see where the lettering was. They should have the same date codes as the others if they're American. Either that or they're modern Coke bottles which have lost their plastic labels.