Thanks Eric. A bit more info: under the pepsi logo it reads "REGD TRADE MARK." I couldn't get a good pic of the bottom so I will try and describe it the best I can....on the bottom, it has a capital "R" within a circle, across from this there is a "5." Below these it reads "15 A 58" I think the "58" might be the year, not sure though.
Hmm, I thought I posted a reply yesterday. I was going to suggest foriegn or an aniversary of some kind. I had a few other points as well. I can't find "R in a circle" Could it be a poor strike B, I or some other letter. Also it looks like a single dot so '58 could be correct.
Should have asked the OZ's. I saw a site with a ton of pepsis broken down by size.
Hey Rob, It is the export version of the same bottle with the ACL. They were made in the late 50s into the early 60s. The R is probable the Reed export mark.