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In page Dalek:

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Four fully functioning props were commissioned for the first serial "The Daleks" in 1963, and were constructed from BBC plans by Shawcraft Engineering.[8] These became known in fan circles as "Mk I Daleks". Shawcraft were also commissioned to construct approximately 20 Daleks for the two Dalek movies in 1965 and 1966 (see below). Some of these movie props filtered back to the BBC and were seen in the televised serials, notably The Chase, which was aired before the first movie's debut.[citation needed] The remaining props not bought by the BBC were either donated to charity or given away as prizes in competitions.[9]