After passively looking for a blue-black 16710 with a 3186 movement, I found a 16710A M-series at a Rolex AD located in Carmel, California. This was the only AD whom I called who knew of the 3186 movement in the classic 16710 case.

I fitted my 16710A with a sapphire caseback in order to watch the Paracrom Blu hairspring. Changing the 24hour hand was smooth, just like the 3186 movement in my Rolex 116710. These 3186'ed 16710 watches have a A and B designation. "A" is for a Red-Black bezel and "B" is for Blue-Red.

The image above shows the watch face with the Arabic II in the watch face, and the bottom pictures show the Paracrom Blu hairspring and balance through the sapphire caseback.

This watch offers a classic, tool watch case, with forward thinking, modernized, movement. In my mind, this watch offers both classic and current Rolex style and technology.

Now, the fun part; breaking it in...... This watch is definitely a keeper

-Sheldon