In Lucky Stamps, your goal is to collect a variety of unique stamps. These stamps can be earned through spinning or completing various in-game activities and challenges. Each stamp belongs to a specific set. Once you gather all the stamps within a set, you'll unlock exciting rewards.

Duplicate stamps can be exchanged for coins and LPs. More and higher rated stamps will give you more rewards. Golden stamps increase all prize values. Please note that you can only exchange stamps once every 24 hours.

You can also trade stamps with your clanmates. When you go to your stamp album, any non-diamond collection, you will see a button next to the stamp set name where you can ask your clanmates for a stamp you're missing.
Press that button and select the stamp you want to request and if your clan mates have it available you will receive it your clan perks.
You can request 1 stamp from your clan mates every 24-hours.
At the moment, Diamond and Gold stamps can not be requested.

If there are no eligible stamps to request (i.e no regular stamps) then the request button will not appear.