http://www.ebay.co.uk/itm/221324147945
Seller describes it as follows: "Scophony Baird high speed mirror drum from a 1930s mechanically scanned 405 line TV set. This is a possibly unique survivor of the scophony system, and comes in its original box (addressed to Mr E.H. Traub, from Mr G. Wikkenhauser)."
Someone has already bid the starting price of £100.