1963 - Weetabix British Cars 3D Cards Free in Packets
25 cards measuring 110 mm x 45 mm
Send Away 3D Weetabix Viewer. These were produced by Sally Thompson, where several shots were taken of the vehicle to decide on the final version - see examples
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Picture of the packet and advert
There are 2 types of viewer available. The red one is the more commonly version