I've just acquired an old PMBX switchboard. Research suggests it is an Ericsson N203B very similar to the one in Ericsson's 1951 catalogue. It has 'TR' moulded into the handset which I take to mean that it was made for 'Telephone Rentals' especially as all the wiring and some of the components have been removed from inside. I don't particularly want to restore it to working condition but I would like to replace the missing components. Can anyone provide me with plans/schematics that might help?
Also where are the best places in the UK to source the missing components or is it 'just' a case of searching anywhere and everywhere?