By the way, the so called swimsuit girl wasn't always a swimmer - she started out as a 'flying girl' as illustrated in this early 1930s cardboard sign ...
I did a thorough search of early paper labels and could not find a single one that has my so called 'champagne glass' design on it. The 'champagne glass' design only appears on acl/painted label bottles. The earliest confirmed acl 7up bottles are dated 1935.
Shown here are two 1935 7up acl bottles. Notice the first one does not have the swimsuit girl nor any bubbles. The second one is amber (from San Diego) and has ...
1. The Swimsuit Girl
2. Bubbles
3. White 'champagne glass' design
So whatever it might have been that influenced the so called 'champagne glass' design, it happened around 1935
Note: I've never seen or heard of a 1935 green 7up acl and I'm confident they did not come out until 1936-37 at the earliest.