Which company holds the Guinness World Record for the 'Smallest Advertisement Billboard' that was actually a functional product package?

The Guinness World Records has many fascinating entries related to product packaging and design. One area where companies compete for recognition is in creating the smallest functional versions of common products. These miniature marvels showcase packaging innovation while maintaining brand identity and usability. Test your knowledge about one famous product that holds a significant packaging-related world record!

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Coca-Cola's 0.15 square inch mini-can billboard in Times Square
Nestlé's micro-chocolate bar measuring 0.27 square inches on a Tokyo skyscraper
Post-it's functional sticky note billboard measuring just 0.12 square inches in London
Apple's working iPhone package display measuring 0.18 square inches in Hong Kong