But does it also have one of the registering Dimples? / Lugs? / Ramps? -- That's mainly what I'm trying to determine. The earliest use of any of those types of registering "buttons" that I'm currently aware of are 1951
SODABOB, I have two 7UP bottles that are pre 1951 that have the lug on them. One is dated 1947 and the other is an 8 bubble 1941. Both are from Owens-Illinois plant Number 3. Hope this helps your research.
I will make a note of those. So far I have only examined the bottles I have, with 1951 being the earliest. I'm just now expanding that search outside of my limited collection. As far as I know, Owens-Illinois was the first bottle manufacturer to use them.