Were Sorrell and Bollore wearing “secret media CEO wristbands”?

What’s that on the wrist of Yannick Bollore, the new CEO of Havas? Matt Bush, the head of agency sales at Google UK,  spotted that the wristband looked similar to one that Martin Sorrell, the head of rival holding group WPP, was sporting earlier in the week. Coincidence, or the signs of a top secret media club in action?