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Please help to identify the set this sticker belongs to, the sticker is on both sides of the ensemble
Bricklink lists this as a sticker over assembly
Part # BA55pb01 : Stickered Assembly 4 x 1 x 2 with Arctic Technic Logo Pattern on Both Sides (Stickers) - Set 8640 - 2 Slopes 45 2 x 1, 1 Slope, Inverted 45 2 x 1
8640-1: Polar Copter
Required, but never shown