Okay, short story.
Browsing r/AustralianNostalgia, someone put up a pic of a 1.5L Coke bottle, asking if someone would give it an approximate date. Everyone noted the "Always Summer" logo device on the side, which puts around early to mid 90's. Me, on the other hand, spotted the phone number on the bottom of the label, which used a (008) prefix, which got replaced by the current 1800 prefix back in the early 90s (I think '93/'94 was when they did the switch). So I stated as much on the post.
Two people have praised me for the attention to detail (including the OP), and it's racked up ten upvotes as of writing. That made me pretty chuffed, considering it's a small, easy-to-miss but significant detail in terms of dating something.