The System 7.5 Watch
From May 1 to July 31, 1995 users who upgraded to System 7.5 could choose between an Apple watch or a copy of Conflict Catcher 3..
The watch band says “Mac OS,” but the software product itself was called “Macintosh System 7.5.” The “Mac OS” logo existed and was shown on the boot screen, but it didn’t become the name of the product until version 7.6.
Update (2016-08-22): Jason Snell:
I have an Apple watch of my own. It’s a “Think Different” model that runs counterclockwise. Oh, ’90s Apple. Such a strange company.
Update (2016-08-24): Brendan Shanks:
To be highly pedantic, the “Mac OS” logo came with 7.5.1. 7.5 was “Wecome to Macintosh” with progress bar.