Description

A digital watch with the digits stacked inside each other.

The time is read from the inside-out, so the 10-hours start in the middle, then the single hours, then 10-minutes and finally the single minutes on the outside.
The digits themselves are quite easy to distinguish.  You just need to note the differences between the 1 and the 7, and the rest should come naturally.
 
Displays in 12-hour or 24-hour format, depending on watch settings.
 
Screenshots show:  
 (1) 10:24
 (2) 09:03 (inverted)
 (3) 20:39 (24-hour format)
 (4) 23:58 (24-hour format, inverted)
 
Designed by Heather Sable and originally appeared on the Tokyoflash Design Studio.   The watchface is published with the designers’ permission, and sanctioned by Tokyoflash.   

The original design can be found here:  
http://blog.tokyoflash.com/2012/05/07/inside-out-lcd-watch-stacks-up-time-digits/