Bird Mask is one of the three skins released in the Carnival of Venice part of the Carnival offer. It could be purchased as part of an item deal in mid February 2017.
Bird Mask could be purchased for $9.99 in a limited time deal that included 16000 coins. It was not available for individual purchase and may not be available for purchase in the future.
Details of this offer may vary depending on location and platform.
Note: The Carnival of Venice sub-offer has been released many times after its original debut. While the skins remained the same, the prices and included items were changed for some releases. The item deal with Bird Mask ($4.99 with 6600 coins) remained the same for all additional limited time releases.
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Bird Mask - Original Image