Reinstalling OSX to sell MBP: disk doesn't appear in Installation

I've made it to this step, but no disk appears (see last sentence below) in the Install OS X window that says, 'Select the disk where you want to install OS X."

So before contacting Apple Support, does anyone know what I can do to continue prepping my MBP to sell?

via Canadian Mac Forums at ehMac https://ift.tt/dy327G5