You can get this pin by collecting complete item collections/sets from the boxes (Carpenter).

This is the amount you need:

Level	Sets collected
	1 Set
	3 Sets
	5 Sets
	12 Sets
	18 Sets

After reaching the 5th level, you can level this pin again with the same number. After that, the color no longer changes, but a number appears on the pin. This shows other users how many times you have reached the last level.

Collections