You can get this pin by collecting complete item collections/sets from the boxes (Carpenter).
This is the amount you need:
Level | Sets collected |
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1 Set |
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3 Sets |
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5 Sets |
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12 Sets |
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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.