Colectors Pins display board - modular

I'm a pin collector, I'm collecting them from all over the world, my friends also buy them for me from their travels.

I made an Europe map pin board but because I have many pins from one country and region (eg Italy) I decided i need a second board system for my additional pins and for pins from outside EU.

This is a simple project, I made the board 20x20 + hook because this is the most that can fit on my printer table. The holes are good size for clasic pins, for bigger ones you yust need to make some bigger in the slicer. 

The board is quite thin but pis usually have short nibs so I add a bit of poster tack under a pin for secure mounting. Table has a hook for mounting on a wall and also a small peg on the bottom for mounting additional boards to the first