Just another mini keyboard skin/wall holder but this one fits my generic 'ebay special' keyboard. There are no marking, names or serial numbers on the keyboard to try and help you identify it so its down to looking at the pictures to see if its similar.
I started with the Rii one (https://www.thingiverse.com/thing:4852219) which was too small, looked at the 'Mini Keyboard Holder' (https://www.thingiverse.com/thing:2795662) which seemed the right size (or very close if not) and kind of made one from the two.
For info, my keyboard at the widest point is 146mm measuring across the top of the buttons that are the numbers row.
The author marked this model as their own original creation.