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You will find a detailled link collection at Martin Benson's Homepage.

He're just a couple of very interesting links of my point of view:

http://fernmeldeamt.de/ Martin Benson Fernmeldetechnik
shows mostly field and military phones and equipment.
http://www.priteg.de Homepage Thomas Göbel
He sells some CD-ROM's with schematic diagrams and descriptions of old German phones (in German only).
http://www.britishtelephones.com/menueric.htm BRITISH ERICSSON AND PLESSEY TELEPHONES AND SWITCHBOARDS
Listing of all British Ericsson Sets - seems to be complete!
http://www.stsf.org/Beskrivningar.htm STSF Beskrivningar
Descriptions of mostly all older Swedish telephone sets, manufactured from Ericsson and Telegrafverket. Homepage of the Swedish Telephone Collector's Association.
http://www.fernsprechtechnik.de/
index.html
Spare parts
of the German W-48-set for sale. (German only).