Here's the base on one of the San Diego bottles, which is in a local museum and the only one I have ever handled personally. Notice the number 21 which is the Owens-Illinois plant in San Francisco ...
Here's a chart showing the various amber 7up bottles. Notice the only "Standard" (non stubby) type is from San Diego. The amber bottles were 7 ounce, but the green bottles (like mine) are 6 1/2 ounce. It also shows the earliest date for the San Diego bottles as being 1936, but the one in the museum and the one owned by Cecil Munsey (who lives in the San Diego area and who I have met and spoken to about these bottles) are dated 1935.
Cecil Munsey Link: Go to his "Articles" section and find 7up: http://www.cecilmunsey.com/
Speaking of amber 7up bottles and Cecil Munsey ...
I recall the conversation I had with him and his telling me that he found the amber 7up bottle while crawling under an old house here in the San Diego area many years ago. He said he used to find lots of old soda bottles that way and that most of them were in near-mint condition. However, he also said he no longer does that because he is just too old for such things. I believe Cecil is in his late 60s or early 70s now.
The reason I don't search under old houses myself, which is where construction workers would often toss their empties while on the job, is because I am petrified of Black Widow spiders that love dark and damp places like underneath old structures. I tried it once and encountered so many Black Widows that I couldn't get out of there fast enough. But if you are gutsy enough for such things, especially if you live in a locale where creepy things like spiders are not a problem, then you should try it and possibly find a truck-load of old soda bottles in mint condition, and possibly some with paper labels still intact.
Because of posting so many soda bottle related replies this morning, and getting pumped about it, I have decided to jump in the car and head for the small town mountain communities of Ramona and Julian. I haven't been up their lately and might find some cool soda bottles in one of the many antique shops that dot the area. But not sure if I can get into Julian because they have been having some brush fires lately. I'll report back later this evening or tomorrow whether I find anything of interest or not. I hope I do! I also hope I get to experience one of the late afternoon thunderstorms they've been having every day this past week. It's been so hot here in town lately that a good downpour is just what I need to cool off.