Not sure which section this should be posted under, but there is a Conn 643 for sale on eBay:
http://www.ebay.co.uk/itm/Conn-643-Theatre-Organ-Conn-pipes-/230707447009?pt=UK_MusicalInstr_Keyboard_RL&hash=item35b73c44e1 (http://www.ebay.co.uk/itm/Conn-643-Theatre-Organ-Conn-pipes-/230707447009?pt=UK_MusicalInstr_Keyboard_RL&hash=item35b73c44e1)
May be of interest to someone.