I found this question pretty interesting, as I've an Atlas necklace and bracelet and always wondered if the Roman numerals were of any significance. So, I visited the official site, and sent a question to the customer service. They promised me a reply in 48 hours and so I waited till I got it:
"Dear [my name],
Thank you for contacting us.
The Atlas design was inspired by the clock above the entrance to
Tiffany's New York store.
We look forward to serving you again in the future."
The person didn't add any extra information, so I guess there's no hidden story behind the inspiration. Although one of the reasons I bought it was that I've always found Atlas, from the mythologies I've read, pretty interesting. You see, he was against Zeus and was punished by being forced to stand on top of a high place and hold the weight of the world on his shoulders. You could say that my studies were stressing me out and I kept thinking about Atlas at that time, and when I found the collection a week later I thought of it as a sign and bought the necklace and bracelet.
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tiffany atlas ring mean