For sale is an OEM Apple Store retail display pad / leather mat. These were used in Apple stores globally up until the switch to a more neutral aesthetic with the Saddle Brown pads. This is the older “Midnight Blue” color.

This one is the biggest of the 3 main sizes, measuring 23.5in x 11.25in.

Last photo is a comparison between the mat for sale (bottom) and a newer condition one. This mat is worse for wear as it has been used as a desk pad for several years. It’s possible it can be cleaned up well with leather conditioning products, but that’s not something I’ve tried.