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Selling Tyer's Three-Wire Three-Position Permissive block instrument
http://cgi.ebay.co.uk/Railway-Block-instrument-goods-line-Tyers-/290440680315?cmd=ViewItem&pt=UK_Collectables_Railwayana_RL&hash=item439f9d137b
Please follow that link ^^
Bids finish in 23-24 hours from now...