A seat back advertising display device attachable to a seat, comprises a bracket 9 for attaching the device to the seat, in particular a grab handle 5 or a headrest provided on the seat, and front and back panels 11, 12 between which an advertisement 15 is held. The device is adapted so that when attached to the seat the front and back panels are inclined from the vertical away from the seat, thereby presenting the advertisement at a comfortable viewing angle to a passenger sitting in a seat behind. In particular, an extension 10 from the device is provided which is adapted to rest against the backrest of the seat to maintain the inclination of the device. One of the panels may be hinged 16 to the other to allow advertisements to be changed and a locking arrangement 14 may be provided to hold the panels together.
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