Actually, I think it went through two washes...
and still works perfectly 
I run three times a week and clip it to the pocket of my shorts so it was only a matter of time before it happened. Seems to have gone in once then remained in the machine and gone around again before I noticed it there.
Cosmetically it barely has a mark on it. A few minor scuffs on the top and bottom edges but that's it.
Maybe I'll drive over it with my car for the next 'test'.
I run three times a week and clip it to the pocket of my shorts so it was only a matter of time before it happened. Seems to have gone in once then remained in the machine and gone around again before I noticed it there.
Cosmetically it barely has a mark on it. A few minor scuffs on the top and bottom edges but that's it.
Maybe I'll drive over it with my car for the next 'test'.